Oh dear, it's time to admit to my age 

. 
 1954 BSA 125 Bantam bought for £9 10s in 1964 ridden(illegally) for about 2 months until my 16 birthday. Feel the power-it would do about 55 flat out with me lying on the tank-3 speed gearbox, plunger rear suspension............
 Got knocked off it after about 6 weeks and broke my arm, had a head on with a drunk in an Austin A35-he was driving up the wrong side of the road on a hill-I came over the top-wallop. He moved the bike and his car before the police came-enough said.
 After that a succession of bikes, BSA Bantams, BSA C10L, C11G, Aerial Colt's, Francis Barnet's, 83cc MV Augusta Sport........passed test on Fanny B, then the big iron started, BSA B31, Triumph T100, T110, BSA SuperRocket, DB34 GoldStar (how I wish I still had that) BSA RocketGoldStar, Vincent Rapide-the list goes on. At one point I never got an insurance certificate, I rode on a succesion of 14 day cover notes, always changed the bike before the cover note expired 

. 
 John