I have the book by Mike Garbett and Brian Goulding,published by Musson Book Company,Toronto,30 Lesmill Road,Don Mills,first published in 1971.To quote from the making of the movie.
"By the time the decision was taken to make the film in 1953 Lancasters were in short supply,and four Mark 7's had to be taken out of storage and specially modified.The actual mine was still on the secret list and the mock-up bore little resemblance,though the underhang is thought to have been specially accentuated for filming purposes to make it more obvious".
Also,if you want to see my dad (1st Div CMP driver from the service corp, and if you have the book,he's walking across Trafalgar Square directly in front of the camera,look on page 126,top picture.Buenos dias.
