What needs to be done re the rioters infesting London and likely to spread elsewhere

"Our Sovereign Lady the Queen chargeth and commandeth all persons, being assembled, immediately to disperse themselves, and peaceably to depart to their habitations, or to their lawful business, upon the pains contained in the act made in the first year of King George, for preventing tumults and riotous assemblies. God Save the Queen!"

Just two snags: the Riot Act was repealed in 1973 and then The Public Order Act of 1986 abolished the common law offences of riot and introduced the statutory offence of riot.

Oh well, I suppose we'll just have to let London burn...