I used to work for John- Duncan’s dad, with Andy his brother. I remember assembling Ossa 250 MAR bikes out of the crates and testing them on a demolition site over the road on Pickford St Macclesfield. Dunc’s bikes were fab, 20 years ahead of any other frames, jig welded front down tubes and swing arm and a donor MAR and off you go (went)! 50 years ago! Hippy 2 stroke days!