Lord Martin told the committee on policing and Parliament he had been "let down" by Serjeant at Arms Jill Pay who failed to require a warrant for the search.
But he said when he asked her to explain her conduct, her boss Malcolm Jack, the Commons Clerk and chief executive, had stepped in and suggested she had been influenced by the police.
Equally unattractive is his propensity to spread blame among his subordinates. As for defending those officials who worked for him, forget it.
Motto - the buck doesn't stop anywhere near my desk.