Excelsior land speed bike thing

1000cc J A P lump apparently. via bubbles44

Elstar J A P engined grass track.

via jomike

Nice B series thumper

Nice BSA B££ or B31 swingarm trials scrambler type thing I saw on Acrosticox's Flickr

Black Country Biker/Moto Freako

Good information about good bikes, Link is here.