Apparently they could be used in Northern Ireland but the Home Secretary at the time of purchase refused to sanction their use due to the risk of injury. So for mainland GB, unusable.
Bit of a stupid comparison tbh. The Russians will use it as a propaganda exercise but this is nothing compared to 1936. It should also be remembered that Boris, a stalwart fighter for democracy, spent £320,000 for three watercannons to be used on the streets of London BEFORE he found out it was...