I have only ever seen one B47. I should say that it was too close for comfort but, as a teenage school boy, I found it very exciting. I was coming out of school, walking through some trees, and heard multiple jet engines approaching. Thinking it was the local RAF Aux Vampires in formation, I rushed out from under the trees to see a B47 come right over us at what appeared to be just above the trees. Certainly the tree tops were blowing about a bit. We then watched it fly in a steeply banked turn around the town and, again, it looked like the wing tip was just above rooftop height.
Most of the papers the next morning covered it on their front pages, describing panic in the streets. Apparently, it did pretty much the same over most of South Wales and Gloucestershire. It was said that the pilot wanted to go back home to the US.