Arthur Desmond Herne Plummer Baron Plummer of St Marylebone Born 25 May 1914, died 2 October 2009. Plummer was elected to St. Marylebone Borough Council in May 1952 and served as Mayor of the Borough in 1958. He was selected as a Conservative candidate for a by-election to the London County Council in St. Marylebone in 1960, and returned unopposed for the safe seat. He was elected to its successor, the Greater London Council, in 1964 for the City of Westminster. He was to become the longest serving Leader of the Greater London Council.