Over the last few days there has seemed to me to be far less plane noise than usual. Either I am becoming deaf, the flight path has been shifted, or there is some vast conspiracy going on - and most people have already fled the UK?
Aircraft usually land facing into the wind. We've been experiencing easterly winds over the last few days, so the planes have been approaching LHR over Windsor, rather than over the centre of the city. Things will revert to normal once the wind swings back to the usual prevailing westerly direction.
JimG, I made the same comment to a neighbour yesterday. It's been really peaceful in Waterloo; no trains, and as you say, not much in the way of airplanes. There's also been very few helicopters overhead the whole weekend; that can't be related to the wind. (Unless the bank holiday prohibits the sight-seeing tours, and if that is the case, the noise we get all weekend from helicopters is definitely the sight-seeing ones and not police/news crews.)