They shift the London flight patterns every now and then, so perhaps they're on top of us at the moment. There's a website that shows maps and circling routes but I can't find it just now.
Found the website I was thinking of - http://lhr.webtrak-lochard.com/template/index.html. Shows each plane flight path on a map, though with delay of couple of days. Does look like as of last Saturday there were plenty planes flying over the area on a loopy path towards Heathrow, but I don't know if that's different from normal.
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