'Sam Weller' my old metal work master at school, was an apprentice at Rollason Aircraft and Engines in the early 1940's, he then went on to be a Lancaster flight engineer for the rest of the war.
He told us boys about an amusing incident on the way to work, coming down the Purley way past the airport in a bus, and seeing what appeared to be a new football goal post sticking up behind the perimeter fence.
Once he was inside the airport he saw it was an American P47 that could not stop in time and had ended up on it's nose, against the fence!
Tony