
Wanton and furious riding is a criminal offence under Section 35 of the Offences Against the Person Act 1861.
But they have to cause injury

Not often you see a horse with a **** halfway up its back.This looks pretty harmless. Do you have any more info about them charging the rival protestors.
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The report says the police have made arrests.seems to be a thing elsewhere too

They are obviously there to intimidate. They ain't there for a lovely ride in the countryside!Here is a video of the horses in Manchester the other day. It certainly looks weird, but it is not clear what is actually happening. I am sure if something serious, like them hassling counter protestors had occurred, we would have seen it by now. Any further videos would be useful:

Yes they "should" but I don't think it's law. It would be construction and use most likely and I couldn't find anything. I didn't look hard tbhSerious question
Shouldn’t they have lights on ?
They are obviously there to intimidate. They ain't there for a lovely ride in the countryside!