Mills came from ‘one of the most distinguished families in English banking’, belonging to the fourth generation of his family to be partners in Messrs. Glyn, Mills & Co. Ltd (from 1864, Messrs. Glyn, Mills, Currie & Co. Ltd.), one of England’s foremost private banks, which provided deposit, investment and merchant banking.
Mills first sought election as Conservative candidate for Northallerton on the Harewood interest in 1859, losing by just two votes to the sitting Liberal MP, William Battie Wrightson. He stood again in 1865, when he stated with regard to church rates that ‘while on the one hand he had every desire to maintain the fabric, he was very much against receiving subscriptions unwillingly’. He was similarly equivocal on parliamentary reform, favouring extension of the suffrage to those suitably qualified, but regarding the franchise ‘as a privilege… not as a right’. If elected, he promised to be bound neither to Palmerston nor Disraeli.
Although Mills did not speak in Parliament during his short-lived tenure of the Northallerton seat, he voted in several divisions, including on the cattle diseases bill, 15 and 17 Feb. 1866, a subject of interest to his constituents. He opposed the second reading of the church rates abolition bill, 7 Mar. 1866, and supported Disraeli’s unsuccessful attempt to add an affirmation of the sovereign’s position as ‘the only Supreme Governor of this realm… no Foreign Prince, Prelate, State, or Potentate hath any jurisdiction or authority in any of the Courts within the same’, to the parliamentary oath, 15 Mar. 1866. His last known vote was against going into committee on the fellows of colleges declaration bill, 25 Apr. 1866. The committee on the Northallerton petition finished its deliberations at noon on 27 April, the same day as the crucial division on the Liberal ministry’s reform bill (when they were victorious by only five votes). With the reform debate still going on at midnight, the Speaker was anxiously consulted as to whether Mills was entitled to vote, and whether ‘in point of delicacy and right feeling’ he ought to. He ruled that Mills was eligible, as his unseating had yet to be reported to the House, but left it to the Conservatives to decide on the second point. The duke of Richmond resolved that Mills should abstain, which he duly did, and he was praised in the press for his ‘commendable taste’ in so doing.
Mills returned to Parliament in 1868 as Conservative MP for West Kent, where he sat until 1885, taking an interest in agricultural topics.
