Parts are scarce. Many parts are compatible with the Morris Minor, Nash Metropolitan and Frog Eye sprite. Those that aren't are catch as catch can.
If you have mechanical brakes in the rear, then the master cylinder and the front wheel cylinders are unique to our cars and can be very expensive to replace. The rebuild kits seem to be common. In my case the original 803cc water pump and oil filter are unique and almost impossible to find.
Bull Motif is the most popular source. AutoFurbish (
www.autofurbish.com) is another source. The autofurbish link isn't working right now. I often Google for parts by part number when I need something and have had success with the Sprite and Mogy community. Kip motors (
www.kipmotor.com) here in the US often has parts. And here's a link to an UK Based web site that has helped locate parts: <
https://www.flying-a.net/> There is also an international club: "Austin A30 A35 Owners Club" That has a spares chairman to maintain and distribute spare to club members.
This car is the source of this saying: