Since I first posted this item more photographs have appeared, and in colour. I’ve added these too as the colour does add something and some of the photos show additional views and subjects..
The Group Captain seen in the left hand side of picture RV 7 is Group Captain Barnett(or it may have been Barrett) and he was Stn Cdr at West Drayton. Subsequently he was promoted to Air Commodore and was AOC MATO. – Richard Elwell