Best Coding Classes in St Davids

Course picks for St Davids

Four courses for Pembrokeshire's cathedral city

Choose whichever course is closest to what the learner enjoys now. Each starts with a free live lesson, and booking needs no card.

Ages 6 to 12

Scratch Coding for Kids

Block programming for younger children, from treasure-map games with grid squares to simple animations.

See the syllabus

Ages 10 to 15

Maths Through Coding

Coordinates, angles and trigonometry worked out in short programs, the mathematics inside every map and GPS.

See the syllabus

Ages 13 to 18

Python for Teens

Python from first lines to full projects, enough to turn Ordnance Survey's coordinate formulae into working, tested code.

See the syllabus

University and adult

Python Masterclass

Python for adults who work with locations, maps or GPS data and need positions that line up across systems.

See the syllabus

Browse the course atlas for more than one hundred options and use the coding roadmap to check prerequisites.

The four we are known for

Python, AI, vibe coding and agentic coding

These run underneath everything above. Every one is live and online, placed by ability rather than by age, and the first class is free.

Vibe codingAges 13 to 17

Vibe Coding for Teens

Python, web and AI projects where the learner still owns the thinking.

See the syllabus

Python and AICollege and adult

Python Automation Course

Automate the work you already do, then let AI carry part of it.

See the syllabus

AI and MLAges 14 to 18

AI and Machine Learning for Teens

Train a model, read what it learned, and be able to say why it is wrong.

See the syllabus

Agentic codingProfessionals

Codex & Claude Code

Run AI coding agents on real work without losing control of the codebase.

See the syllabus

St Davids today

A tiny city in a thinly settled county

Census 2021 results from the Office for National Statistics, taken from Nomis, for the middle-layer area the House of Commons Library calls St Davids and Letterston, with Pembrokeshire and Wales for comparison.

Census 2021 counts for the St Davids area
Where	People living there	In full-time education (aged 5 and over)	People per square kilometre
St Davids and Letterston	7,238	14.1%	34.9
Pembrokeshire	123,360	16.8%	76.2
Wales	3,107,494	19.9%	149.9

Space around the city

The St Davids and Letterston area has 34.9 residents per square kilometre; Pembrokeshire as a whole averages 76.2, and Wales 149.9.

An older population

In St Davids and Letterston, 8.6% of residents were aged 65 to 69 and 7.5% were aged 70 to 74; across Wales, 5.8% were aged 70 to 74.

Learners at home

Of the area's 6,978 residents aged five and over, 987 were in full-time education, and 253 people lived in communal establishments.

Each percentage comes from its own census table, because the tables are adjusted separately for privacy. Our St Davids classes take in the city and the scattered settlements of the peninsula. A Caerfarchell eight-year-old making a first game, a Year 11 student near Clegyr-Boia preparing for WJEC GCSE Computer Science and a Trevinert adult learning Python to map walking routes could each join a different class, placed by level.

Cathedral and palace

A cathedral rebuilt after a fall and an earthquake

Dates below come from Cadw's full listing reports for the Cathedral of St Davids (record 12537), the Bishop's Palace (12558) and Porth-y-Twr (12541), all listed at Grade I.

1180 to 1220

Cadw describes the present cathedral as substantially of these years, built by Bishop Peter de Leia, who was responsible for the nave, its arcades and much of the transepts and choir aisles.

1220 and 1248

The central tower fell in 1220, bringing down the choir and transepts, which were rebuilt by 1250; the east windows of the presbytery were repaired after earthquake damage in 1248.

About 1200

The Bishop's Palace was begun around 1200 and largely built under Bishop Bek (1280 to 1296) and Bishop Gower (1328 to 1347). Stripping the lead from its Great Hall, under Bishop Barlow, began its ruin.

Cadw records that the cathedral was restored mainly by Sir George Gilbert Scott between 1862 and 1878, and that the west front is Scott's re-creation of the Norman original after a rebuilding by John Nash in 1793. Porth-y-Twr is a 14th-century bell tower with an attached fortified gate, possibly of the 15th century; Cadw records that the tower was restored in 1929 by W D Caroe. Cadw also lists the City Cross at Grade II*. We have no connection with Cadw or St Davids Cathedral, and the history here is taken from Cadw's reports.

Where the coordinates come from

Cadw's listing data gives the cathedral a National Grid position of 175156 east, 225430 north. Ordnance Survey's guide to coordinate systems supplies the ellipsoids, projection constants and Helmert parameters, and the Environment Agency publishes both grid references and latitudes and longitudes for its gauging stations.

Signature project

Why does GPS move the cathedral 83 metres?

The National Grid is drawn on an ellipsoid called Airy 1830, fitted to Britain in the 19th century. GPS uses a different ellipsoid, positioned for the whole Earth. The same latitude and longitude therefore name two different spots, and converting between them is a three-step job.

Converting Ordnance Survey grid references to GPS latitude and longitude, compared with the Environment Agency's published coordinates for 9,536 gauging stations
Method	Typical gap	Worst 5% start at	Largest gap
Grid to latitude and longitude, no change of ellipsoid	110.2 m	not needed	138.2 m
Grid to latitude and longitude, then a Helmert transformation	1.01 m	1.81 m	2.21 m

1. Undo the map projection

Turn easting and northing back into latitude and longitude on the Airy ellipsoid, using the Transverse Mercator formulae in Ordnance Survey's guide. Our code reproduces the guide's worked example to four decimal places of a second.

2. Move to 3D

Convert latitude and longitude into X, Y and Z coordinates from the centre of the Earth, so both ellipsoids can be compared in the same space.

3. Shift, stretch and turn

Apply seven numbers from the guide, three shifts, a scale change and three tiny rotations, then convert back to latitude and longitude on the GPS ellipsoid. The guide's Helmert example comes out exactly.

How good is a Helmert transformation?

Ordnance Survey's guide says a single Helmert transformation gives errors of up to 3 metres (95%) in position, because the old triangulation behind the National Grid bends slightly from place to place; its exact national method, OSTN15, uses a grid of corrections instead. Our test agrees: against the Environment Agency's published coordinates, the median gap is 1.01 metres and the largest 2.21 metres. We do not know which method the Agency used, so this is agreement with a trusted list, not a proof of accuracy. Skipping the change of ellipsoid entirely puts every station between 85.0 and 138.2 metres out.

At St Davids Cathedral the conversion moves the point 44.3 metres north and 70.5 metres west, 83.2 metres in all. That is less than the smallest shift among the English gauges, a reminder that the gap between the two systems varies across Britain. For anyone following GPS directions to a door, 83 metres is the difference between arriving and not.

Working with coordinates

Five checks before trusting a position

Learned on St Davids, then used for delivery apps, drone flights, field surveys, sports tracking and any program that mixes maps from different sources.

Decisions behind the St Davids coordinate project
Question	For St Davids	What goes wrong if you skip it
Which system is each number in?	Grid on Airy 1830, GPS on its own ellipsoid	Two positions for one place, 83 metres apart
Does the code match the source?	Both worked examples in the guide reproduced	A formula typed wrongly and never noticed
Which way do the rotations turn?	Signs taken from the guide, then reversed as it says	An answer that doubles the error
How accurate is the method?	Helmert: up to 3 metres, as the guide warns	A 2 metre error treated as exact
Tested on real data?	9,536 Environment Agency stations	Code that passes one example but fails elsewhere

The third row is a genuine trap. Ordnance Survey's guide warns that two opposite conventions exist for the rotation angles, and the parameters it lists run from GPS towards the National Grid. Going the other way means changing the sign of all seven numbers. Get it wrong and the rotations push the point the wrong way; the worked example is what confirms the direction.

Younger learners

Finding squares on a grid map, then discovering that two maps with different grids give the same place different numbers.

Teenagers

Trigonometry, series expansions and matrix transformations in Python, tested against Ordnance Survey's worked examples.

Adults

Combining location data from different sources without silent shifts, with every conversion checked against a known answer.

We have no connection with Ordnance Survey, the Environment Agency, Cadw, St Davids Cathedral or Pembrokeshire County Council. The guide, station list, listing data and census tables are published openly; the conversions and comparisons on this page are our own work.

Learning ladder

From grid squares to the Helmert transformation

The ages are only a guide; the free lesson finds the right starting step.

Ages 6 to 10

Grids and maps

Grid references, treasure maps and moving a sprite by coordinates in block code.

Scratch Coding for Kids Coding for Kids

Ages 11 to 13

Coordinates in Python

Distances, angles and simple conversions between two made-up grids, written as short programs.

Python and AI for Kids Maths Through Coding

Ages 14 to 18

Real map projections

Transverse Mercator, ellipsoids and the Helmert transformation, each step tested against Ordnance Survey's examples.

Python for Teens High School Mathematics

Ages 18 to 67

Location data at work

Merging GPS tracks, map layers and addresses in Python without positions drifting apart.

Python Masterclass Data Science Course

Coding and AI

AI can write a coordinate converter in seconds. Why should a St Davids teenager build one?

Because an 83 metre mistake looks exactly like a correct answer until you test it.

A chatbot asked to convert a grid reference will often return a latitude and longitude with confident decimals. Whether it changed ellipsoid, and which way it turned the rotations, is invisible in the answer. A learner who has reproduced Ordnance Survey's worked examples knows to ask for that test before trusting any converter, human or machine.

The project also teaches the difference between precise and accurate. Our answers carry six decimal places, yet the method is only good to about two metres. Saying how accurate a result really is, not just how many digits it has, is a habit AI tools rarely model.

So a St Davids teenager should keep learning to code in 2026, beside a cathedral Cadw dates to 1180: machines can produce the numbers, but a person has to check they point to the right place. The longer argument is in why coding is worth learning in 2026.

Delivery

Caerfarchell, Trevinert or Whitesands, and one class

St Davids sits among farms and hamlets on a thinly settled peninsula. Online, a learner at the end of a lane is as close to the lesson as one in Cross Square.

City and peninsula

A learner in Rhodiad-y-Brenin and another in Upper Solva can share one class without anyone making the drive.

Welsh schooling

Families will recognise our stages: they are matched to Welsh school years and the Curriculum for Wales, with WJEC GCSE and A level course names, though every lesson is taught in English.

How the free lesson works

The learner builds something real in the first session, and the teacher then suggests a level, a course and a weekly time. We do not ask for a card.

A class at every stage

Five to ten learners at one level, drawn from St Davids, the rest of the UK and abroad, so each stage has good times to choose from.

Two lessons weekly

Two fixed lessons each week, about eight a month, with holidays and exam weeks planned with the teacher well ahead.

Teachers on Indian time

A class that starts at five in the afternoon in Pembrokeshire is a late-evening lesson in India, at 21:30 there during British Summer Time and 22:30 in the winter months.

Across Pembrokeshire

Learners in Haverfordwest, Fishguard, Narberth or Neyland join exactly the same classes, since every lesson is online and classes are formed by level.

Fees

St Davids lesson fees

The first lesson is free, and then one fee is paid each month.

First classUSD 0

A complete lesson without charge, ending with a suggested level, course and weekly time.

Group tuitionUSD 100

About eight live lessons a month, in a class of five to ten learners at one stage.

Private tuitionUSD 150

About eight live lessons a month, with a teacher for your learner alone.

Families in Whitchurch or Treleddyd-fawr pay in US dollars, like every family outside India, and our site shows no pound prices anywhere. Payment starts only after the free lesson, once you have settled on a course and a weekly time with us; the pricing page explains pauses, missed lessons and moving between a class and one-to-one teaching.

Request placement Check availability

Reviews

Six family reviews from Google, unchanged

Rated 4.9 across 547 Google reviews. These are real reviews, reproduced as written.

★★★★★

"The one step solution for my son. Modern Age Coders make learning coding so simple that kids love it. The teachers explain complex concepts clearly with practical exercises and interactive content."

Ria Mukherjee

Parent

★★★★★

"Modern Age Coders has been a game-changer for me. I struggled to grasp IT concepts and coding before joining, but their classes transformed everything. I can now confidently write complex programs with ease."

Samriddha Mondal

Student

★★★★★

"One of the most wonderful education centres out there. Education is not limited to school syllabus but focuses on skill development."

Vansh Agarwal

Student

★★★★★

"My child Dhairya is really enjoying the Modern Age Coders classes. This is his first online class and he eagerly looks forward to it. I can already see his improvement, and the teachers are very cooperative."

Sonam Oswal

Parent of Dhairya

★★★★★

"Modern Age Coders have wonderful teachers who teach in a clear, easy and practical way. The teacher boosts students' confidence and inspires them to learn without hesitation."

Sonu Goyal

Parent

★★★★★

"I highly recommend this computer coding class! The teachers are incredibly knowledgeable and passionate about coding."

Ritu Kedia

Parent

Free placement class

Book a free lesson for a St Davids learner

The first lesson depends on the learner: a grid-map treasure hunt for a young child, a short Python program that measures the distance between two map points for a beginner, or Ordnance Survey's coordinate formulae and a Helmert transformation for a teenager ready for real geodesy.

FAQ

St Davids coding class questions

The questions St Davids families ask us most.

How many people live in and around St Davids?

Census 2021 counted 7,238 usual residents in St Davids and Letterston, the middle-layer area that contains the city, at 34.9 people per square kilometre. Pembrokeshire as a whole had 123,360.

How does the area compare with Wales?

Much more thinly: 34.9 people per square kilometre here, 149.9 for Wales overall. The age profile is older too, with 7.5% of residents aged 70 to 74 in 2021 compared with 5.8% nationally.

What is a Helmert transformation?

A way to move coordinates from one model of the Earth to another using seven numbers: three shifts, a scale change and three small rotations. Ordnance Survey publishes a set for converting between GPS coordinates and the National Grid, accurate to about 3 metres.

Why do GPS and the National Grid disagree?

They use different ellipsoids, mathematical shapes for the Earth. The same latitude and longitude on each names a different point; at St Davids Cathedral the two are 83.2 metres apart, 44.3 metres north and 70.5 metres west.

How was the conversion tested?

Against both worked examples in Ordnance Survey's guide, reproduced exactly, and against 9,536 Environment Agency gauging stations, where our results agree with the published coordinates within 2.21 metres. We are not connected with Ordnance Survey or the Environment Agency.

How old is St Davids Cathedral?

Cadw's listing report describes the present building as substantially of 1180 to 1220, built by Bishop Peter de Leia, with the central tower falling in 1220 and the choir rebuilt by 1250. It is listed at Grade I.

When do St Davids lessons run?

Families here usually book a slot after school, on a weekday evening or on a weekend morning, and we fix it in the free lesson. With teachers based in India, an early evening on the peninsula is late at night for them: the gap is four and a half hours while the clocks are on summer time and five and a half hours from late October to late March.

Is there a St Davids centre?

No. We have no centre in St Davids or anywhere else in the UK, because all lessons are live online. A learner needs a computer with sound and a stable connection, and our phone number is Indian.

What do St Davids lessons cost?

The first lesson is free. After that, a group place costs USD 100 a month for two live lessons a week, about eight a month, with five to ten learners; one-to-one teaching on the same timetable costs USD 150 a month. Nothing is charged until the course, format and time are agreed.

How are learners grouped?

By level, pace and goals rather than age or location, with five to ten learners at the same stage. Where no group fits the learner's week, we offer one-to-one lessons.

Explore Wales and the UK

Wales and beyond

Along the south coast, the Swansea page hunts for the month roadside air changed, and in the north St Asaph reads which way a valley faces from a height map. Learners working towards WJEC GCSE Computer Science or WJEC GCSE Digital Technology have their own pages. To see how our stages line up with a Welsh school career, open the Wales guide; for any other UK city, start from the UK coding page.

Book the free class Message us on WhatsApp

Four courses for Pembrokeshire's cathedral city

Scratch Coding for Kids

Maths Through Coding

Python for Teens

Python Masterclass

Python, AI, vibe coding and agentic coding

Vibe Coding for Teens

Python Automation Course

AI and Machine Learning for Teens

Codex & Claude Code

A tiny city in a thinly settled county

Space around the city

An older population

Learners at home

A cathedral rebuilt after a fall and an earthquake

1180 to 1220

1220 and 1248

About 1200

Why does GPS move the cathedral 83 metres?

1. Undo the map projection

2. Move to 3D

3. Shift, stretch and turn

How good is a Helmert transformation?

Five checks before trusting a position

Younger learners

Teenagers

Adults

From grid squares to the Helmert transformation

Grids and maps

Coordinates in Python

Real map projections

Location data at work

AI can write a coordinate converter in seconds. Why should a St Davids teenager build one?

Caerfarchell, Trevinert or Whitesands, and one class

City and peninsula

Welsh schooling

How the free lesson works

A class at every stage

Two lessons weekly

Teachers on Indian time

St Davids lesson fees

Six family reviews from Google, unchanged

Book a free lesson for a St Davids learner

St Davids coding class questions

How many people live in and around St Davids?

How does the area compare with Wales?

What is a Helmert transformation?

Why do GPS and the National Grid disagree?

How was the conversion tested?

How old is St Davids Cathedral?

When do St Davids lessons run?

Is there a St Davids centre?

What do St Davids lessons cost?

How are learners grouped?

Wales and beyond

Keep exploring Modern Age Coders

Coding classes in nearby cities

Free resources

From the blog

Start here