some stories you have simon.... I believe that TT F1 & TT F2 werent exactly production classes, more like production based motors in free chassis. Again, you were there, not me!
guys in a dutch forum found this picture. The astralites and the "street racing" background give it away as somewehre in UK in the 80's no? Could this be any of the guys you knew? If it's a TT F2 racer, then other than a different fork, brakes abd wheels, this 82' bike is amazingly stock
Last, turns out that "slick" bass was tuning F2 kawis back at the time. might try to contact him and see what the remembers. read he's a bit of a character, but who knows, might be willing to help