This has been going on in the US and Germany for some time (and no doubt in plenty of other places), but I hadn't heard of it in the UK before (except for coming across some kind of car rally in the lower part of Westferry Circus on a couple of nights, but those didn't look much like 'performance' cars):
It's been going on along that stretch of the A10 for a good few years. Not sure why there, seems to be a combination of the big retail centre car parks and the dual carriageway (although it's a 30mph limit and loads of speed cameras now).
This has been going on in the US and Germany for some time (and no doubt in plenty of other places), but I hadn't heard of it in the UK before (except for coming across some kind of car rally in the lower part of Westferry Circus on a couple of nights, but those didn't look much like 'performance' cars):
https://www.standard.co.uk/news/london/enfield-boy-racing-north-circular-deaths-banned-b1198750.html