Happily, I was on a (virtually) opposite routing on last night's BA 216 (IAD-LHR). Our flight time was 6:24, vs the scheduled 7:25. Ground speed was pushing 700mph for quite a chunk of the flight. Obviously that meant that the last 15 mins of the flight were spent (presumably with a bunch of other east coast arrivals) circling over north London, waiting for 6am to tick by...