British or French -- you may be able to tell by the threading of the bottom bracket cups. In your parts photo, it looks like the cups might be Stronglight. Check the fixed cup (which it appears you haven't removed) for either engraved threading info, or number of incised "rings" and report back. If English thread, the fixed cup will be left-hand thread, but if French, it will be right-hand thread -- I would advise that you not attempt removal before ascertaining which it is.
Doesn't look like a particularly high-end frame, though it might be fairly old -- 70s (likely), or maybe even 60s. Front wheel is low-flange, and rear high-flange, so it's probable that the front wheel is a replacement. Are the rims 27" or 700C? Tires should tell which, and front and rear might be different if the front is a replacement.