Well this thread got pretty stupid.

This is the only vague info I could find about putting a british BB into a swiss shell. I can get a shimano BB for $10 so I am going to at least try it on my moto.

This is from the peugot page linked previously:
"French bottom brackets need to replaced with French bottom brackets only.
Swiss bottom brackets should be replaced with Swiss only. British bottom brackets may fit as the
threading is very close. British cups in a Swiss frame will be a little lose or sloppy as the British thread is a slighly smaller diameter but its also a slightly different pitch. Because of the difference in thread
pitch they may not thread all the way in. Some times they work, sometimes they dont. British bottom
brackets are readily availble at any local bicycle store."