I see that the jet engine is from Metropolitan Vickers
My uncle Jim was a plumber/fitter at Metrovicks, as it was known, in Trafford Park, Manchester,during the war. But he didn't work on the products, his job was to maintain the equipment & services for the factory. One day he was told to lay an additional cold water pipe to the furthest part of the factory, where he heard a terrific, loud, screaming and roaring noise. Of course, it was an early jet engine, but I, like most other people at the time, he had never heard one before. He asked the foreman what the noise was
"I didn't hear anything lad, and neither did you. Now, finish your work and bugger off."
Jim said it was about 1958 or 59 before he told anyone about it.