Mills, a partner in the family bank of Glyn, Mills and Company of London since 1777 and a former East India Company chairman, was an anti-Catholic Tory in Parliament, where he attended infrequently, and a reformer of convenience in Warwick, which he had represented on the independent interest since 1802.
In the House, 2 May 1820, he praised the worsted manufacturer John Parkes’s invention for reducing emissions from industrial furnaces, which he had seen in use at Warwick, and advocated its adoption in ‘the country at large’. He was appointed to the select committee on the subject later that day. He had refused to comment on reports of Parkes’s bankruptcy, which he knew were correct.
Mills had no children and by his will, dated 3 Jan. 1826, and proved under £120,000, he left his London house to his wife and his Warwickshire estates to his clergyman brother Francis and his heirs. His nephew Charles, an East India Company director since 1822, succeeded to his banking interests. Another nephew, Arthur, declared but desisted at Warwick in 1832.
