[melsec]

I think they count like Democrats. NO drone photos? Mostly elevated ground photos. Looks about 300k from the mass photos I have seen maybe someone will come out with aerial shots but t the lack of them at present is telling

[Winniesboy]

Here is a BBC drone video. I've no idea how you estimate numbers from this sort of evidence, but it does look like a lot of people:

Brexit march: Million joined Brexit protest, organisers say