To deflect the Chinook topic even further is the VC10 still flying, though officially retired?
Today I saw a (military looking) large jet, swept back wings, 4 engines at the tail, quite noisy. Too far away to see any details but as in Oxfordshire looked to be headed for Brize Norton, was pointing that way anyway.
Or are there other makes with that configuration?
The VC10 last flew in September 2013. I spent a large part of my professional life between 1994-98 teaching people the fine art of sticking things up the VC10's arse. Sport of kings!
The RAF eventually owned 36 of the 54 VC10s that were built, though only around 22 flew in RAF colours - the rest were bought from trade and reduced to spares, mostly at RAF Abingdon (as was). It was a nice aeroplane to fly, and among the very fastest subsonic airliners, but by god it was thirsty. It burned the same amount of fuel (about 10 tonnes/hour) as a 747-200, despite being much less than half the size.
Edit: to answer your question, you didn't see a VC10. I doubt you saw an IL62 either, but I don't know where you were. That info might help identify what you saw.
Edit 2: doh, TimC, RTFQ!! Yeah, as PB says below, B1B is most likely, going to Fairford.