In 1878, he inherited the baronetcy of Leigh Court, Somerset, from his father William, who had previously been Conservative MP for East Somerset along, with estates in Somerset. He had his own estate in County Kerry, Ireland. He was cousin of Philip Napier Miles, Frank Miles and Katharine Tennant.
He supported an amendment to the Representation of the People Act 1884 and the Franchise Bill debated earlier that year, that would have allowed votes for women who were householders on equal terms with men. The vote was defeated and women finally received the vote in the UK in 1918.
Miles baronets, of Leigh Court
Motto
Labora sicut bonus miles
Arms
Azure a chevron paly of six ermine and or between three lozenges argent each charged with a fleur-de-lis sable, in chief upon an inescutcheon argent a sinister hand appaume coupled at the wrist gules
Crest
Upon a helm barry affronte with visor open a dexter arm embowed in armour proper garnished or supporting with the hand an anchor also proper
In 1848, he married Frances Roche (1827–1908), daughter of Sir David Roche, Bt, Roche baronets, MP for Limerick. Frances was a renowned society beauty nicknamed the "Venus of Miles" in reference to the classical sculpture the Venus de Milo. She attracted a number of admirers including Charles Manners, 6th Duke of Rutland who scandalised society by leaving his 120-foot yacht, Lufra, to her in his will.[2] They had the following children:
Alice Catherine Miles (1850–1926), who married firstly in 1870 George Duppa, JP (1819–1888), and secondly in 1889 Lt Col Gerard Vivian Ames, 1st The Royal Dragoons (1853–1899), having six children between the two marriages.
He died of acute laryngitis at his London house, 75 Cornwall Gardens, Kensington, SW, and was succeeded by his son, Cecil, in 1888. His widow subsequently married an American from St Louis, Missouri, Dr John Nicholls, in 1904 and they lived at Maidenhead, Berkshire, and she died in 1908.
The diary of Alice Miles was discovered in the 1980s amongst Duppa family papers and published in 1993 in edited form and with commentary, as "Every Girl's Duty: The Diary of a Victorian Debutante".
The Times, report of Parliamentary debate, 12 June 1884.