Lord Haddington was elected a Scottish representative peer from 1874 until his death.

He was honorary Colonel of the Lothians and Border Horse and an officer in the Royal Company of Archers.

[2] Lord Haddington was appointed a Knight of the Order of the Thistle (KT) in the 1902 Coronation Honours list published on 26 June 1902,[3] and was invested by King Edward VII at Buckingham Palace on 8 August 1902.

The marriage produced seven children:[5] His eldest son George predeceased him by a few months, dying in January 1917, and so the title passed to his grandson George Baillie-Hamilton, 12th Earl of Haddington.

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