Arrived back in the UK yesterday, with much jet lag.
I got stacked and racked over Washington Dulles for an hour before being allowed to land. I got lucky, most of the planes in front of us in the stack had to divert to Reagan which would have been bad as there aren't any international flights out of Reagan. If I'd gotten diverted I'd would have had to overnight in D.C. unless I could have persuaded someone there to put me on a plane to Chicago or another major United hub.
Needless to say once I was on the ground, in an airport that had been more or less closed for four hours due to weather, things didn't really improve. On the other hand, I eventually made it out and onto a plane and got back into the UK only a couple of hours late, so it could have been worse.