Some guy dressed as Batman delivered a wanted man to a police station in England before disappearing into the night.
Her Majesty The Queen is in the hospital for one day and the entire constabulary force collapses forcing citizens to resort to vigilantism to keep their streets safe.
My plan to save the UK:
1. Release the prisoner Charles Bronson and appoint him as the head of a new police force with jurisdiction over the entirety of the UK.
2. Film the whole thing, Manhunt style, and release it as Death Wish 6: Tea Time Is Over starring Charles Bronson playing Charles Bronson as Paul Kersey.