Ah, struggling with the terminology here. Actually think it's a cottered bottom bracket. Pretty sure the BB is the original. The bike has a single downtube shifter, also original so definitely had some gears. Dad can't remember whether it was 3 or 5 speed.
I am trying to renovate my Dad's 1952 Hobbs of Barbican Blue RIbband bike. I've got most of the parts I need (mixture of nice old GB parts and some modern replacements). The things I am struggling with are the chainset and the derailleur. It's set up as a 5 speed and the square taper BB...