sentences:  Following the 1966 escape of the spy George Blake from Wormwood Scrubs, Mark was appointed to the Mountbatten inquiry into prison security.Here he attracted the attention of Chancellor of the Exchequer Roy Jenkins, and in February 1967 was appointed Assistant Commissioner "D" (Personnel and Training) of the Metropolitan Police, where his welcome was less than ecstatic from a force that did not like outsiders; at the end of his first week, he was encouraged by Commissioner Sir Joseph Simpson to apply for the post of Chief Constable of Lancashire.The following year he was briefly appointed Assistant Commissioner "B" (Traffic).