Ainslie's main career was as an arable, dairy and sheep farmer at Home Farm, Mildenhall, Wiltshire. In politics he was a socialist when he left school, and commented in 1985 "I voted Labour in 1945 and got disillusioned with the party by the end of the 1940s". In the 1950s he became a radical Liberal of the age inspired by Jo Grimond, and he was passionate about European unity, state education, and world development. In 1962, with the support of others, Ainslie re-formed the moribund Devizes Constituency Liberal Association and established the Thrifty Orange in Marlborough, an early charity shop, to raise funds for it. In 1964 he was first elected to Wiltshire County Council, and he continued to represent his rural area at that level for nearly thirty years, until 1993. Although during those years the county was predominantly Conservative, while Ainslie was an outspoken Liberal, he served as chairman of the county's Education Committee from 1973 until 1977. He stood unsuccessfully for Parliament in Devizes at the 1974 and 1979 general elections, and when in 1982 the SDP-Liberal Alliance agreed a division of constituencies between its two parties, it was a blow that he had to surrender Devizes to the SDP. Ainslie was a member of the local Alliance negotiating committee for Gloucestershire and Wiltshire, and he gave up his own position in Devizes to allow a younger Liberal to contest Stroud. However, he remained a strong supporter of the Alliance and later of the new Liberal Democrats. In 1979, he contested the first direct elections to the European Parliament as a Liberal and in 1984 fought a strong SDP-Liberal Alliance campaign for the Wiltshire Euro-constituency, gaining over 60,000 votes. This campaign helped the Alliance to succeed at the county elections of 1985, when its members found themselves forming the largest political group and Ainslie became Chairman of the County Council, a post he held until 1989. During the same period, he was simultaneously chairman of the county council's Policy Committee, which made him the de factoLeader of the council, as well. In 1990, Ainslie became the chairman of 'Action for the River Kennet', a group he helped found which campaigned against pollution and excessive water abstraction. After he died at Mildenhall on 5 January 2007 aged 85, Sara Morrison, a former vice-chairman of the Conservative Party, said that it was "the end of an era... when we took our public duties and responsibilities very seriously", and the Labour peerLord Faulkner of Worcester described him as "...a representative of the old school of parliamentary candidates in country areas; urbane, intelligent, knowledgeable on rural matters, a gentleman". Roger de Vere, Ainslie's successor as chairman of ARK, said "He was a great leader and a great man." In June 2007, former Liberal Democrat party leader Charles Kennedy MP proposed the establishment of an annual countryside lecture as part of Ainslie's legacy.
Family
On 21 April 1951, Ainslie married Shelagh Lilian Forbes, and they had one son and three daughters. Their children were Andrew John, Sarah, Serena and Teresa. Their son, Andrew Ainslie, took over the family farm.
