Cannot be standard - I don't believe the factory would have fitted two horn buttons and with coil ignition you don't need a cutout button. The clutch lever is inboard of the valve lifter and dipswitch. Both clutch and brake look too far in to be used from the grips. I spoke to the last owner of this bike at the 50th aniversary of the demise of the factory and he, if I remember correctly, he told me he had owned it since about 1963 but not ridden it since the sixties. When it came up for auction it had been restored to within an inch of its life so was probably never intended to be ridden again. Although the last owner told me he had three Vins, two of them enclosed, and he lived close to VOCspares in Lymm, he came by car.