Had a good look at it on FR last night. A bit of a unique situation caused by the proximity of LGW, LHR and LCY, and the huge cell of weather to the east over the coast that threw out all the arrivals.
As previous posters stated, a/c were skirting right around London and coming back in from the North which must have completely screwed up the usual STARS. Even some of the eastbound departures from LHR were heading South to France before heading east. Oddly though, there was the odd a/c ploughing straight through the middle. Guessing they were lucky at times to find a safe a route through the middle on the weather radar.
If you step back and think for a second and look at the volume of aircraft travelling into one of the busiest and most complex sectors in the world - hats off to the ATCO's and drivers who kept everything incident free!!