The Broadcast Centre
In 'Media Village' data centre/apps room/etc in W12 which does much of BBC and other channels' playout was specced years ago to be able to cope with 30 degrees outside temperature....always seemed a little low to me.
That was for the technology they expected to put it in then. It was never 'full' in my time but with things like virtualisation, there is less space used but it can use more power.....
Also I believe BBC news web stuff might be at least partially hosted there and that row of bays was always rather warm and closely packed.