High Quality Content by WIKIPEDIA articles! Ian Hedworth John Little Gilmour, Baron Gilmour of Craigmillar, PC, Bt. was a Conservative politician in the United Kingdom. He was styled Sir Ian Gilmour, 3rd Baronet from 1977, having succeeded to his father's baronetcy, until he became a life peer in 1992. He served as Secretary of State for Defence in 1974, in the government of Edward Heath, and, although a leading figure on the socially liberal, or "wet", wing of the Conservative party, he also served in the government of Margaret Thatcher, as Lord Privy Seal from 1979 to 1981.