@scarfolk That tweet from the Met is strangely authoritarian in tone, far from an attitude of service to a population whose differing views are to be protected even-handedly.
The tweet's implied threat, and its realization in the subsequent arrest Graham Smith for gathering their placards, is wrong, and should be condemned whether you agree with the protest or not.
This kind of thing from law enforcement, combined with the role of #surveillance in the UK, is worrying.