In the late 70's I stumbled upon a couple of Greeves bikes parts that someone had abandoned in the desert. I was intrigued by the cast aluminium frames. It was probably one of the earliest uses of aluminum that I knew of at the time. There was not enough parts to piece together a complete bike but, rather, a walk down memory lane. Very interesting with the "plunger" forks. I was told the forks worked surprisingly well. Nobody does green paint like the Brits.
Great video Chris, thanks for posting this. Regarding Craig's Griffons, the Gold one is actually a 380cc QUB Mk1. As you noted, the original 380 Griffon had twin exhaust pipes that came together under the tank. It produced a very respectable 38bhp. The work that Dr Gordon Brown did at Queens University Belfast resulted in the QUB that has a single exhaust pipe. In QUB form the motor produced 44bhp, outstanding in its day. The other Griffon with the alloy tanks and blue mudguards is a 380cc MkII QUB. Very little different in the engine department (although the barrel fins had been shaved back a bit), the main difference was the move to long travel suspension, with leading axle forks and laid down rear shocks. The MkII dates from 1976.