found it!
Built on the Shetland Isles by a Mr. Frazer in the late '60s. chassis is a Daimler DB18, engine and box are from a 3.8 Jaguar ordered new from the factory. The doors are from a VW! Looking closely I think the rear side windows are too (from a fastback, not a notchback). the reg. no. is BPS 177H