I found myself with a Jewish contingent, largely but not entirely from the Jewish Socialist Group, on the anti-war demo today. We thought we may have had a minyan, which is the minimum required for certain Jewish religious purposes. Then we realised there were two women among us and women don't count in a minyan. Luckily there were several tens of thousands of other people about so all was not lost.
I googled "demonstration" and all the news was from America until I got to the bottom of the page and Socialist Worker was the only site with coverage of the demo in the UK. That may well change by tomorrow. There is a report in the Guardian but it didn't appear in Google news.