not his dad, just an employee. gary has worked for brian since way back in the day, not long after he left college.
dont want to go into a history lesson but.... brian did his apprenticeship at rickman (i think), who make motorbikes. he left them to start up his own business making 'scramble' bikes, what we know today as motocross or more like enduro bikes. they had a really good reputaion for handling, so good that both yamaha and honda had them make the factory frames in the later half of the 70s. just after this, gary having just done a welding apprenticeship asked if brian would take him on, he did, and the bicycle side of the business came from garys interest in bmx.
gary now has taken over the business, which pretty much now only produces push bike frames.
i am really impressed with the collection that you have, but i am not convinced that pr frame was made by curtis, as there were other manufacturers making bikes of almost equal quality. possibly made at the wilson factory? there headtubes look really similar.
i also know the whereabouts of a freestyler frame, from 84, and two cruisers (complete bikes) both from 83 i think.