Wherever you were in the march, your estimate would be way off if you weren't aware there were several separate "feeder" marches from different start points in London, all converging on Whitehall and/or Trafalgar. The Palestine bloc (160-odd orgs) was it's own separate tributary, as was the Jewish bloc. There was a "silent" march for those with sensory issues, a shorter route for those with impaired mobility, etc.
It certainly dwarfed Tommy's fascist carnival last year.
Emeritus Prof Christopher May (npub12pw…zvxn)