I won't be Kev, but for comparison the number you have to beat is 400,000 plus - the fox hunting rally rally was the biggest public demonstration of all time in the UK. No public disorder - no arrests - not even litter. In terms of size it was twice the size of the anti-Poll Tax demonstrations - size = degree of support and commitment.We'll see.
By the way thanks for the link from which I extracted the following:
"Supporters of the Stop the War Coalition include:
George Galloway MP, Jeremy Corbyn MP, Alan Simpson MP, Tam Daylell MP, the Muslim Parliament, ASLEF, ..."
"The Muslim Parliament"!!!!! Just exactly what is that????