We have these - or similar ones - flying high above this area in circles for hours on end. As I type this there has been one that I can see from the office window flying round and round for the past hour or so. If you're quick and in Scunthorpe, Hull, Goole, York (maybe), Pocklington and Beverley - you may see it flying high and round and round - just look for the circular contrail. I have some photos somehwere - although the plane was a few thousand feet up so you can only just make out the radar dish.