Fairford and Greenham Common both received B36 units from the early 1950’s onwards, in fact Greenham took the last deployment of a B-36 to Britain in September 1957.

September 1957 sounds a likely date when I saw my B-36, that year saw a warm summer and it was probably at the end of the school summer holiday, it would have been the first year that I was allowed alone up to our train bridge, would anyone let a 6 year old do that now, definately not, mind you that place was the local meeting place for every kid in the area and anyway, my older brother and his gang were usually lurking in the area ready to kick ass if neccesary, and they did sometimes, but I mustn’t grass up a now esteemed chartered accountant.
My other thought is that it may have been off to a Battle of Britain airshow possibly Finningley which is on the Notts/Yorks boundary.
That year I went to Syerston and it wasn’t there, I know I never saw one at an airshow here, hopefully I will get my hands on my brother’s aircraft pictures at Xmas and be able to scan some goodies from that period.
With regard to a possible US invasion of Europe, try the Irish airfields thread, there are some interesting leads there, notably the probable lack of German occupying troops in the country which may have lead to a welcomed US force invading Ireland, especially with all the US/Irish connections.
There was a very good film made in the 60’s in black and white about the aftermath of a German invasion of Britain, I can’t remember the title of it and haven’t seen it for a while, I’m sure that some scribe on here will know which film I mean.
The film was not made by a major film company and was shot almost as a documentary which made it more believable.
I seem to recall that at the end of the film, the Nazis were struggling in Russia and the occupying troops were at a minimum, there was a very active resistance movement and the US had landed in western Ireland and were building up supplies and troops, along with British forces, Churchill was running things from Canada, which was always the plan I believe, despite the fact he pledged to fight to the last himself. Weren’t all our gold reserves sent there on the Queen Elizabeth battleship, I think during 1940 under great secrecy.