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.
Prime Minister of New Zealand restrict the term of appointments to the Legislative Council. The title of "prime minister" was used by Richard Seddon after 1901, following New Zealand's self-exclusion from the Federation of Australia. Seddon's immediate successor, William Hall-Jones, was the first to be sworn-in as "prime minister", in 1906. The expanding power of the prime minister was kept in check by the need to build consensus with other leading members of Cabinet and of the governing party, including those who represented various ideological wings of the party. Other institutions, including Parliament itself and the wider state bureaucracy, also acted as limits on prime