This bike suffered a catastrophic engine failure:
I had fitted, an "improved" camshaft and changed the gearing. The end result was that a valve dropped into a piston, which in turn came out through the side of the engine. Made in 1957, I owned it from 1962 to 1968.

BSA A10 Road Rocket  650cc approx 40 bhp
At its best it went at 100mph (indicated).

UOL 898

Rudge Ulster 500cc 34 bhp approx 95mph
Single cylinder with a four valve head

DAT 574