Welcome to the mad world of the Austin 7. As you are new to the car, here's some background that I hope you'll find useful - there is, of course, even more if you search online:
CLUBS:
There are so many Austin 7 clubs that, in 1969, an association of them was formed - and this is now the go-to place that hosts a mass of important data:
https://a7ca.org/ It's a large site with lists of clubs, a superb archive of historical data, reproduction handbooks, chassis and car registers, A7 history, A7 model identification, events, etc, - explore the A7CA website:
https://a7ca.org
The page that links to the most important sections is:
https://archive.a7ca.org/
DIRECT LINKS to HANDBOOKS, PARTS MANUALS, and SALES CATALOGUES
A comprehensive collection can be downloaded as PDFs:
https://archive.a7ca.org/collections/han...rts-lists/
Sales brochures can be found here:
https://archive.a7ca.org/collections/show-brochures/
The Pre-War A7 club has a useful Facebook page:
https://www.facebook.com/groups/pwa7c .... with other enthusiasts forming groups for specific models or regional interests.
As a club member, you will receive not only the club's magazine but also the Association Magazine, published quarterly since 1970
https://a7ca.org/about-us/magazine/
BACKGROUND and BOOKS:
To read the fascinating background to the car - with reproductions of the notebook by Stanley Edge the design draftsman see:
https://a7ca.org/austin-seven/the-people/
Austin 7 books can be bought from:
http://www.pwa7c.co.uk/bookshop.php This is a good collection of material including historical and technical literature with data on specific models such as the Type 65 and Nippy, Grasshopper and Ulster, etc.
For engine, other mechanical work and restorations one highly recommended business with personal attention and much helpful advice is:
http://www.albaaustins.co.uk
IS YOUR CAR ALREADY LISTED?
To see if your car is listed (or to add it - that would be very useful) the A7CA provides a list of known vehicles:
https://a7ca.org/chassis-register/ It includes versions by English Austin, American Austin and Bantam, German Dixi and BMW, and French Rosengart. You can search by Model Type and also chassis, car, and registration numbers.
For new Austin 7 parts try these links - in no particular order of recommendation:
David Cochraine at:
https://www.a7c.co.uk/aboutus.php
Jamie Rogerson at:
https://www.theaustinsevenworkshop.com/
http://austinrepro.com/ This company offers standard and also beautifully made, difficult-to-find reproductions of headlamps, speedometers, rev counters and various items for standard cars and also the Swallow, Nippy, Ulster, etc:
For both new, used and some refurbished parts try: Tony Betts at
http://www.7ca.co.uk/ and
http://www.southernsevens.co.uk
Another link with details of other repairers, restorers, gearbox, suspension and bodywork experts, etc:
https://oldcarservices.co.uk/austin-seven-specialists/ (some of these will be out of date).
If you want to know about 'Technical Data & Specifications', thread sizes, etc, this page will help:
https://www.austin7.org/Data%20Pages/Tech%20Data/
The Cornwall Austin 7 Club's web site is especially useful with lists of suppliers and much technical advice, etc.
https://www.austin7.org/
INTERESTING ODDS and ENDS
For 25+ pages of digitally restored, interesting and high-resolution Austin illustrations (that you can download and print out) see
http://www.lathes.co.uk/austin7
Fitting indicators, a guide is available here:
http://www.lathes.co.uk/austin-7-indicators
Improving the lights:
http://www.lathes.co.uk/austin7-2/page18.html
For the 100th anniversary of the Seven's introduction in 2022 which a thousand cars attended watch the film here:
https://a7centenary.com/