This is a BOAC Mosquito being boarded by a crew but I don't think Captain Pelly is one of them
LIFE: War 1939-1945 Wwii Air United Kingdom - Hosted by Google
One may be Ron Ashley mentioned in Stephen Greensted's photos
Ron and crew at RAF Leuchars,1943 | Flickr - Photo Sharing!
Correction, according to the IWM from whom a copy of the BOAC Mosquito photo may be purchased, the passenger on the right is congratulating Captain Wilkins(on the ladder?) and his navigator for a safe flight