Nicholas Leonard: Cameron's clash with police is sure to hurt
The abrupt collapse of law and order in London and other English cities last week is imposing massive strains on the unity of David Cameron's coalition government and on its relationship with the police.
Cameron has been warning for years about the dangers of a "broken society". A year ago this week, he talked eloquently about the challenge of "dealing with the issues of family breakdown, welfare dependency, failing schools, crime and the problems that we see in too many of our communities".
But when those 'issues' turned into the lurid reality of riots, violence, arson, looting and even deliberate murder on the streets, he was as shocked as anyone.