UK based. Where to get supplies for DIY pedals?

I REALLY fancy building a Maestro Fuzz clone based on the original. Point to point wiring etc.. I've got a soldering iron sitting there doing nothing and some spare time during week days due to my job.

Does anyone know where people get housings, resistors, capacitors etc etc in the UK? Amazon seems to sell a load but I dont want 100x some value part that I wont ever use.

Also where do others find the right schematics?