Parliamentary Private Secretary to the Prime Minister Bonar Law's Parliamentary Private Secretary, J.C.C. Davidson acted in effect as his Chief of Staff. Margaret Thatcher's downfall from the Conservative Party leadership in 1990 is attributed by many to the actions of her Parliamentary Private Secretary, Peter Morrison, in failing accurately to count votes amongst Conservative backbenchers. Some Parliamentary Private Secretaries to the Prime Minister go on to hold higher office; Lord Dunglass served as Parliamentary Private Secretary under Neville Chamberlain and later went on to serve as Prime Minister in his own right. There can be multiple Parliamentary Private Secretaries to the Prime Minister at a given time.
Deputy Prime Minister of the United Kingdom Deputy Prime Minister of the United Kingdom The Deputy Prime Minister of the United Kingdom (DPM) is a senior member of the Cabinet of the United Kingdom. The office of the Deputy Prime Minister is not a permanent position, existing only at the discretion of the Prime Minister, who may appoint to other offices – such as First Secretary of State – to give seniority to a particular cabinet minister. Due to the two offices tending not to coincide, and both representing the Prime Minister's deputy, journalists will often refer to the First Secretary of State as the Deputy PM.