Cannot think of anything with four engines at rear other the IL62 or VC10 and neither seems likely to sprout winglets.
What direction was the OP's machine headed?
At this end of the county, just over the M1 from Northampton, we get Birmingham inbounds just released to Brum coming down to FL60 and turning from N to route own nav Honiley. Castle Don inbounds are heading roughly north and around FL170. Type and livery discernible with naked eye.
Other n/s stuff is mostly dots at FL250 or so except for slower climbing heavies off LHR.
Military stuff more likley to be E/W to/from for Brize or Fairford when active. Again, type usually discernible by eye and for VC10 or Herc, by ear too.
Last edited by Airbanda; 7th Aug 2012 at 09:03.