...and now for the ICR to weigh in; Rob's Vernon chassis pic is of a 1952-1956 Mk 1 or Mk 2. These two marks had the Villiers 8E engine with separate starter motor (was it ever proved that the motor was from a sit up & beg Ford?), a setup practically identical to that used in the production Gordon. Richard's pic is of a 1957-58 Vernon Invalid Car Mk 3, which uses a Villiers Mk 9E unit with Dynastart, in line with the Ministry of Health's 1957 Standard Specification for invalid carriage running gear. It is thought roughly 1,500 Vernon's were built, 500 Mk 1's, 500 Mk 2's and 500 Mk 3's. None are known to have survived today.
In 2008 I located the only known surviving
part of a Vernon Invalid Car, being the complete engine, starting system and engine cradle of a Mk 2. The owner was only intrested in the engine and was due to bin the rest, therein I was able to direct the leftovers towards the final completion of the Hammond Collection Gordon's starting system. No doubt Rob will recall exactly which bits were used in the end, but I've got an idea it was the big fast & loose pulley and the main crank nut?
Here below is that Vernon engine as found.