Hello Jack - Thank you for your message and for the information
From all the information on this site I have researched I think the unit I have maybe:
Supercut (1963¬?)
Villiers Mark 12/1 RG four-stroke engine (fitted with 3-1 reduction gear). Capacity 120 c.c.; output 1.5 b.h.p. at 2,800 r.p.m.;
ignition—Villiers fly¬wheel magneto;
carburettor—Villiers B10/1;
fuel tank capacity-1 gallon.
Would the accessory be for the transport wheels perhaps?
Yes it will be the l-o-n-g project *smiles*
Thanks again