I have managed to locate this car in a collection in Spain. It is listed as a: 1924 Hispano Suiza H6C Coupe by Coopers of Putney.
Further research indicates that H. F. Cooper Motor Bodies specialized in brokering and fitting bodies from various sources to various chassis (especially Rolls Royce). Since I understand that Cooper did not move to Putney until 1931, and, given the stated date of the chassis, I would deduce that the current body was not the original, but one mounted (built?) by Coopers sometime after 1931.