Worried about security in London tomorrow? Maybe you should be. A month ago Lynne Owens, an assistant commissioner of the Metropolitan Police, had this to say to the Commons Home Affairs Committee, which was hearing evidence on thepolicing of the TUC march:

we will be preparing to police any protests on the day of the royal wedding very robustly, but what we should remember is it is a different sort of event. It is a security event, which will giveus different powers under terrorism and other legislation, and we now have a much broader intelligence picture about the sort of protest activity that we can expect and we will be delivering asafe royal wedding for the royal couple and for this country.

This morning several squats across London were raided by police. A coincidence, obviously.