In 1864 he married the Hon. Eleanor Leicester, daughter of the second Lord de Tabley.
Baldwyn Leighton was the 8th Baronet, residing at Loton Park, Alberbury, in Shropshire, with a London residence at 49 Upper Brook Street. He appears to have been been on the fringe of Whistler's social and artistic circle and prepared to extend some protection and patronage to Whistler.
He was a magistrate, and Conservative MP for South Shropshire until 1885. Extracts from his letters and speeches were published in 1875.
He edited the letters and writings of Edward Denison MP, and wrote Recollections of Theodore Mansel Talbot and his time, 1889; The lull before Dorking, 1871; The Farm Labourer, 1872; Agricultural labour, 1872; Depauperisation, 1875, and Main roads and local taxation, 1875.
Vincent, John, The Formation of the British Liberal Party 1857-1868; Kelly's London Postal Directory, London, 1865; The Annual Register, London, 1897, p. 141; The Mayfair, St James's, Soho and Westminster Directory, London, 1886-87, amd 1887-88.