Call the police then. You'll find that law enforcement is carried out by them in this country rather than vigilante groups. Unless of course you consider that there is some civil action you can take.

Which reminds me of the 2002 election poster from the CONservative party - "you've payed your tax, so where are the police?"

Had they not realised that they had split rather acrimoniously around 1986? Of course later reunited as is the fashion