Ooh, I was doing so well, then a "collectors' fair" came to town...
A very late Rolls razor in great condition, which came with box and full instructions, for £6
An alloy PAL razor for £2, and a brass "Made in England" copy of an Old style razor, for £1
What was a boy to do?
The PAL is for a friend who has been looking for a light and cheap travel razor, so I won't count that as my spend. And there's probably a 50/50 chance the Rolls is my birth year, and I've already had a shave with it - I'll post more details in the Safety Razors forum.
Anyway, I haven't given up - I'm just not going to spend a penny more than this £7 on shaving gear in May!