Vanneck was born on 7 January 1922 in London, the youngest son of Lord Huntingfield and American born Margaret Eleanor Crosby. He spent his early years in Australia during his father's tenure as Governor of Victoria in the 1930s. He attended Geelong Grammar School and was sent back to Britain to study at Stowe School, having won a scholarship.
Vanneck joined the Royal Navy during World War II. He studied at the Royal Naval College as an officer cadet from 1 January 1940 to 1 September 1940, when he passed out as a midshipman. He served on during the operation to sink the Bismarck, and on HMS Eskimo. He commanded a LCA during service off North African coast. Having attended a promotion course in Portsmouth from May to August 1941, he was promoted to sub lieutenant on 10 October 1942 with seniority from 1 August 1941. He joined the crew of the sloop in December 1942. He was promoted to lieutenant on 25 May 1943 with seniority from 1 December 1942. HMS Wren was part of the 2nd Escort Group under the command of Captain Johnnie Walker, the most successful anti-submarine unit of World War II. He commanded a Motor Torpedo Boat from August 1944 to the end of the war. After the war, he trained as a pilot. On 30 September 1945, he transferred to 771 Naval Air Squadron of the Fleet Air Arm. The squadron was based at RNAS Yeovilton. He transferred to 807 Naval Air Squadron on 18 August 1947. He retired from the Royal Navy on 24 May 1949, when he resigned his commission.
Vanneck then went into business with the engineering company Ransome's in Ipswich, followed by Rowe and Pitman in the City of London. He was appointed to the Council of the London Stock Exchange in 1968. He was Deputy Chairman from 1973 to 1975. He retired from the Council in 1979.
Political career
Vanneck became involved in Municipal affairs through the City of London Corporation. After a year serving as a Sheriff of London in 1974, he was elected the 650th Lord Mayor of London in November 1977, towards the end of the Queen's Silver Jubilee year. He held an eloquent speech at the Guildhall in which he recalled the first time he had met The Queen, who accompanied her father during a visit to the Royal Naval College when Vanneck was a young cadet there. A popular Lord Mayor, Vanneck declared that despite his interesting careers, he had missed out on the one he would most like, which was to be a tug-boat skipper on the Thames. He made excellent contacts with his Paris counterpart Jacques Chirac and arranged an official visit to visit. Vanneck was a Francophile who was fluent in French. At the end of his Lord Mayoral term, Vanneck was adopted as Conservative candidate for the European Parliament for Cleveland. He won the seat at the 1979 election, enjoying his time in the European institutions. He was vice-chairman of the Political Affairs committee and served on Energy Resources and Technology. After keeping his seat by only 2,625 votes in 1984, he lost in the 1989 election, and then retired from public life.
Later life
of Suffolk from 1974 until his death, Vanneck continued to enjoy yacht racing. Vanneck was a freemason. He died on 2 August 1999 in London.