Is this the ex-Phil MacKelvey Aero 8, that was being turned into a Morgan Challange car?

Olleyjp, as a suggestion, perhaps Russell could check what the factory have in terms of crash test cars / seriously damaged Aero 8s. There was a time when they had a few at Malvern (written off by dealers / journalists, etc), perhaps they could offer you some salvage parts? As it is an S1, you may struggle as I believe all the cars were later series. However, I'd be surprised if they cannot offer you spare parts for the S1.