Thanks for posting this David. My uncle, Seumas Vane-Hunt, entered and finished the 1939 Land's End Trial. He was on a series A Comet, borrowed from Jim Kentish. The registration number of the Comet was FGU 729 and his entry number was 180. Class solo motorcycles, starting from London.
Jim Kentish was also in this trial on his Series A Twin, DUR 98 and his entry number was 82. I have a program and there were quite a few Vincent's entered.
Mike.