On a political earthquake Richter scale rating of resignations, the shock resignation of John Healey as defence secretary in a row over armed forces funding is the sort of event which would bring tall buildings with dodgy foundations crashing to the ground.
Mr Healey may not be one of the headline names in the Cabinet but he is highly respected and will always be a Labour loyalist first and foremost. This is not a man who makes a habit of rocking the boat.
