In London, at least, it varies wildly on who is reporting the statistics. The BBC will usually shill for the government, whereas you might have more luck with The Guardian for something a bit less biased - as long as you're not looking at their opinion pieces.

It's a regular battle in the UK. We've had several huge protests that have likely reached hundreds of thousands, where getting out of the area is ten times worse than getting out of Wembley Stadium, yet the BBC have reported "several thousand", or have shown images where it's a small subset of the people there.

[–] [email protected] 5 points 10 months ago

I didn't really see any reports stating anything other than "thousands". I checked The Guardian and it's the same there. If London and DC were to reach a million or even close to it, you'd expect one or more likely both of them to be in hundreds of thousands.