Also shared from Veryan Herbert's archive was a blank letterhead from Gordon & Glynn which along with Yimkin Engineering was owned by his mother Phylis Herbert. Both companies were located at No.73-79 Cadogan Lane in Chelsea, London with Gordon & Glynn also being the distributor of Yimkin's speed equipment.
Interestingly the Technical Director for Gordon & Glynn listed on the letterhead is the F1 Racing Driver Jack Fairman. As well as racing for the F1 Connaught Team his career also spanned Bentley, Bugatti, Bristol, Jaguar, Ecurie Ecosse and Aston Martin. It's likely he also had connections with the Jaguar Racing team Warren Pearce who were located at 59a Cadogan Lane - seven doors down.
Yimkin is also incorrectly spelled as YIMKEN in the footer of the letterhead. Which is also how the Ex-Clive Puzey car photographed here in Rhodesia is labelled.