Many thanks for your help. I have traced the details regarding these two aviators through the Flight International Archives.
They are on the left Mrs de Havilland and on the right Capt Geoffrey de Havilland. On July 25 Capt. Geoffrey de Havilland accompanied by his wife,establishment of a new world's altitude record for the 2-seater light aircraft. He took off from Stag Lane in a standard " Moth " fitted with the new 85-100 h.p. " Gipsy " engine, and reached an altitude of 21,000 ft.