BOAC Whitley photo 5 from bottom on
http://ww2bombers.e-monsite.com/page...whitley-2.html
Did your father ever mention the Curtiss CW-20 Commando prototype 'St Louis' which was also tried on the Sweden run?
The photo-site for Gothenburg-Torslanda airfield which was used as a diversion from Bromma sometimes has a few pics of BOAC types including Mosquitoes
"ESGB"