<<I saw one when I was a kid too. When I told my older brother (who'd just joined the ATC)I'd seen a plane with 6 engines on the back of the wings, he hit me saying there were none in the country! (Must've been about 1954 - could have been the same one!)>>
Could have been, T. I lived in Morden and it was routing Lydd, 7Oaks, Epsom, Woodley, Green One. I can still hear it!