I'm on the BA49, due to pushback at 1525 and we're now almost at the runway - so not too much of a delay for me at least. Flight deck said that all departures were halted (we were #4 for pushback once they resumed, but other aircraft were queuing on the taxiways)
At least it's not all of the south east's ATC crashing! There's a video on Twitter of the fire engines trailing behind it as it pulled off the runway