[1] He was an Ulster Unionist politician and served as Member of Parliament for Fermanagh and South Tyrone.

On 20 October 1966, the then Lord Hamilton married Alexandra Phillips, daughter of Lieutenant Colonel Harold Phillips and Georgina Wernher, herself the elder daughter and co-heiress of Sir Harold Wernher, 3rd Baronet, of Luton Hoo, Bedfordshire.

Their wedding at Westminster Abbey was attended by members of the royal family, including Elizabeth II and the Queen Mother, and Prince Andrew was a pageboy.

[7] In 1964 he became Ulster Unionist MP for Fermanagh and South Tyrone, succeeding his cousin, Lord Robert Grosvenor.

[14][2] In 1987, he served as a judge in Prince Edward's charity television special The Grand Knockout Tournament.