Damaging "A" Boards on the pavement

[Aprisa]

Every evening I pass a small group of people protesting passively outside of an establishment with posters affixed to "A" boards placed in the middle of the pavement.
I was wondering if there could be any action taken against someone "Accidentally" knocking into these boards and by walking on them rendering them U/S?

I don't really want to get into an argument over whether they have good reason to protest or not just that each time I pass I have an urge to confront and make a case for the other point of view!

[Aprisa]

Well looks like I'll have to just Scowl a bit ;-)
Its an anti-abortion protest with provocative pictures, I just want to scream "go and do some useful voluntary work that will actually aid those who are vulnerable rather than standing around hands clasped looking smug!"

[Aprisa]

It used to be that they were there for a week or so then gone for a few weeks (between 3 and 5 people usually heads hung muttering prayers) but over the past six weeks or so its been every night. Its outside a Marie Stopes.