NOBODY LIKES a riot except looters and journalists. The Metropolitan Police, being the go-ahead and dynamic modern police service that it is, has any number of contingency plans for dealing with civil disturbance. From farmers with truckloads of manure to suburban anarchists on a weekend break and Saturday jihadists. What I suspect they didn't have plans for was just over two thousand enraged opera lovers pouring out of the Royal Opera House and going on a mad rampage through Covent Garden.