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At the 1906 general election, he was selected to stand as the Conservative candidate in Paddington North, where the sitting Conservative MP Sir John Aird was retiring and the local Conservative Association had found difficulty in selecting a candidate.
His father, William Harcourt Isham Mackworth (1806—1872), a younger son of Sir Digby Mackworth, the 3rd Baronet, took the additional surname Dolben after he married Frances, the heiress of Sir John English Dolben, the 4th Baronet.
Sir John Aird, 1st Baronet (1833–1911), English engineering contractor associated with Aswan Dam, MP for North Paddington
Under Aird's leadership, the firm also became internationally famous for building the first Aswan Dam; the business was also later engaged to increase the height of the dam.
He is the son of Sir John Renton Aird, 3rd Baronet and Lady Priscilla Heathcote-Drummond-Willoughby.
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On his father's death on 20 November 1973, he succeeded him as 4th Baronet.