This Bentley Mk VI Convertible was first registered in July 1951. The saloon body was replaced with the current convertible body by coachbuilders Leyshon-James. The source of your image indicates the rebody took place during the 1980's. Another auction site with different pictures of the same car, indicates it was rebodied in the 1960's.
I also found, Leyshon-James built at least one more Mk VI, that looks just like this one. It is red.