Another one of those odd USAF round-the-houses routings - C-5 85-0010 has departed Rota, headed mostly due north over the Bay of Biscay to Penzance, now cracking ENE up the West Country and currently will pass over here Heathrow in a few minutes. Presumably enroute Ramstein, unless it diverts further NE and drops into Mildenhall... Mind you, I've noticed in the past that a lot of airliners operating from/to Spain or Canaries seem to avoid France and route up to Western Approaches before taking a more easterly heading to UK or Dutch airports or wherever - or vice versa.