Did not see the programme, but driving like that he does not deserve an M type! RX 7782 was chassis number 2M1299 and had a build date of 25th March 1930 and was a Red 2 seater with engine number 1125A. The file says "Used as a stock demonstrator until January 1931. Engine 1319A fitted May 1930" The first owner was an F. Adnitt. Cheers, Mike