There's definitely going to be more than one protest. I'm not super involved in the UK because I don't live there, but I do know they have a strong organizing presence. This is basically an underground movement, which might be doing illegal things. It's up to each local, and some may not want a bunch of lay people showing up who may not be down with the St. Paul's Principles or be an infiltrator. If you want to go to a protest, then just get involved, meet someone, and ask.