On the X (aka Twitter) Thundersaloon account are some pics of the car along with a link to an ebay ad, but it also mentions of the car as
"..... believed to be the ex Jim Evans Ford Escort Mk1 Turbo which was seen racing at Croft in the mid 70s. "
This link should go direct to the tweet I refer to
https://twitter.com/Thundersaloons/s...26126651691424