Described by the 4th duke of Newcastle as ‘a shy and silent man – but very clever’, Bentinck devoted his life to fox-hunting before entering Parliament in 1846 to support the protectionist cause, led by his elder brother, Lord George Bentinck, to whom he was close.
In March 1846 Bentinck was brought forward by his father, with the support of the 4th duke of Newcastle, as a protectionist candidate for the vacancy at Nottinghamshire North created by the death of the sitting member. With his brother, George, alongside Disraeli, leading the protectionist opposition to Peel over the corn laws, the timing of the by-election was critical, and his entrance into politics was praised by Disraeli, who gleefully wrote to his sister Sarah that ‘Lord Henry Bentinck is going to give up hunting and give himself up to politics to support me!’
Not only had Ld Henry never in his life ever opened his lips to speak, but it so happens that he has never been in the way of hearing a speech from any other individual – so that he was utterly unacquainted with the conventional modes of addressing an assembled audience.
Unhappy reactionary, 144.
Despite such misgivings, Bentinck delivered an effective and belligerent speech at the nomination, accusing Peel of ‘general treachery and desertion’ and warning that the protectionists were ‘not dead beat yet’.
Bentinck duly voted against corn law repeal, 27 Mar. 1846, 15 May 1846, and followed his brother into the division lobby against Peel’s protection of life (Ireland) bill, 25 June 1846. At the 1847 general election, he fiercely criticised the policy of free trade and echoed his brother’s call for an ambitious scheme of railway building in Ireland, though he stopped short of endorsing his proposal to endow the Roman Catholic Church, stating that he would only support the continuance of the Maynooth grant.
Bentinck abstained from the votes on Roman Catholic relief, 8 Dec. 1847, and Jewish disabilities, 17 Dec. 1847, unlike his brother, George, who supported the bills and whose support for religious toleration saw him subsequently resign the leadership of the protectionist party, 23 Dec. 1847.
Most highly gratified to find how strict [Bentinck] is in his political principles – how tenacious he is of a most unsullied and unsusceptible honour and how extremely anxious he is that our existence as a party should depend upon our maintenance of the purest principles.
Unhappy reactionary, 154.
Although Bentinck remained loyal to Disraeli, and played an important role in securing his leadership of the Conservative party, he made little impact in the Commons.
At the 1852 general election Bentinck issued an address calling for the ‘re-imposition of a moderate duty upon untaxed foreign grain’.
Bentinck retired from Parliament at the 1857 dissolution, following a feud with his elder brother, John, now the fifth duke of Portland, who was a Peelite. The source of the feud was a loan of £25,000 given by the two brothers to Disraeli in the late 1840s to help fund his purchase of Hughenden Manor, and thus cement his position as a country gentleman.
Having ceased to be a resident in this county, holding no personal stake within it, and no longer in any manner whatever representing the family interest, it appeared to me that I was not now the fitting instrument to defend the Conservative interest in the division [and] that it would be morally wrong to place a large majority of my most zealous supporters in a false position with their landlord.
Following his retirement from public life, Bentinck returned to his first love of sport, hunting in the winter and deer-stalking in the autumn. In the summer he played world-class whist at the Portland Club and invented the call for trumps known as Blue Peter.
Bentinck died suddenly from heart failure at Tathwell Hall in December 1870.
