It is the Skinner Special or White Minor or with arbara Bolster at the June 1937 Shelsley
Well done Esteban! I think Allan Lupton must be offline!
Barbara and Peter Skinner were the children of SU owner Carl Skinner and he gave them 2 very special Morris Minor cars which had been highly tuned and supercharged. Barbara's car was white and known as "The White Minor" and her brother's car was red.
By the time this photo was taken Barbara had married John Bolster.*
(*I dread to think what after-dinner stories she heard from her husband - hopefully the ladies withdrew to another room when the gentlemen had their port and cigars.)