I work at Sheffield, and it didn't seem to be anyone based there. Since it wasn't talking to either Doncaster or Sheffield, it was probably based elsewhere.
Initially I heard the same as Jinkster.....or did he tell me, I'm not sure? However, on the way home a couple of hours ago I listened to BBC Radio Sheffield, hoping for some more news. They said that it was a two seater light aircraft, that two people had been injured, but no-one taken to hospital. So it sounds like possibly better news than we initially thought, if they got it right. Apparently, eye witnesses saw the aircraft circle before it landed in a field, so - again if they got it right - it sounds like a forced landing, but under control. I hope this is the case anyway. Apparently one lane of the M18 was closed for a while, but traffic was moving slowly by the time I reached the area, though I don't go that way home and didn't see anything.