Thank you to Sarah and the team at the Formula Junior Historic Racing Association for the support and posting the yimkin.co.uk story on their Facebook page today. If you're not aware of this group it's a must for any FJ enthusiast with an amazig array of cars on site.
Based on the information to date it's unlikely that Yimkin Chassis No.7 ever made it to the track so unless there's a real twist to the story the car won't be eligible for FJ racing. But if the car is rebuilt FJHRA have kindly offered to consider the car for FJ UK Invitation Class H.
Hopefully some of the membership will have memories of the Yimkin garage in Cadogan Lane in Chelsea and get in touch with more details on the history of my project.