Thanks Gentlemen. I suspected it might be a BRM, but when compared to the original V16 car there were obvious differences, especially in respect to the size and the snakepit of exhaust pipes. I hadn't known that there was a Mk2 version. Incidentally I was at Oulton Park when Jackie Stewart did a demo lap in what was probably a Mk 1 V16. The noise it made was unbelievable! Having said that, I was last night watching a video of Gordon Murray's new T50 supercar at Goodwood. The noise that makes it equally incredible.