If you are looking to buy this car as a Fia car, i suggest you examine the papers before you buy. I don't think they will be current.
if you want a Fia car then you need to talk to Nigel Reuben at
http://www.nigelreubenracing.com
CRT 999C could be converted to Fia spec at a cost.
The John Spires Fia car JFR 600E (which was the last of the 10 Martin Lilley built Griffs) has just sold at Silverstone auctions for £165 000. It has a Nigel Reuben rolling chassis and bodywork.