I have a lots of experience working with Minox format submini cameras. The originals (Minox III, IIIS, B, C, LX, etc) are brilliant, superb bits of mechanical camera workmanship.
The 'toy' cameras, like the miniature Leica IIIf, can make a decent photograph but are not really up the the standards of lens quality, etc, required to take seriously. They're fun, however.
Film and processing can be obtained from Blue Moon Camera (
https://www.bluemooncamera.com/) in the USA. I don't know who in the UK is a stockist or provides services for Minox format film at this point in time. Since once upon a time I used to be in London on a reasonably frequent basis, I remember there was a camera shop near the British Museum that had a ton of Minox submini equipment and film in stock ... I have no idea whether they're still there, it was at least a decade ago that I last recall being in the shop for a visit.
I've always shot B&W in Minox format and processed my own film using the Minox daylight loading tank. Since the mid-1990s, I scanned the negatives directly and rendered the scans for display and printing. Nowadays, I scan the negatives with a copy camera setup ... See
https://flic.kr/s/aHskshuyHV.
If you go for it, take it lightly and enjoy it! It's just a tiny sliver of a negative so don't expect grandiose things.
😀
G
Minox EC, APX 400 - XTOL