Polhill was descended from a family, possibly a branch of the Cornish Polwheles, long settled in Kent and Sussex. His grandfather, Nathaniel Polhill (1723-82), the son of William Polhill (1689-1765) of Burwash, prospered as a tobacconist at 35 Borough High Street, Southwark, which he represented in Parliament as a Wilkite from 1774 until his death, and as a partner in the London bank of Langston, Polhill, Towgood and Amery at 29 Clement’s Lane.
John Polhill entered the army in 1780 and attained the rank of captain in the 15th Hussars before his retirement in about 1793. With his wife Mary Bennett he had three sons: Thomas, baptized in January 1795, Charles, baptized a year later, and Frederick. Charles died in 1813.
Ministers listed him as one of their ‘friends’, and he voted with them on the civil list, 15 Nov., though it was thought at first that he had been an absentee.
The present administration are Whigs, honest Whigs, and as such they shall have my support so long as they advocate the cause of the people; but should they forsake them, then I will forsake the ministry.
Northampton Free Press, 25 Jan. 1831.
On 22 Mar. he declared his support for the second reading of their reform bill, for which he voted later that day, though he complained that the proposed £10 borough voting qualification would disfranchise many poor electors, and said that one of £5 would be ‘more useful and more just’. He voted against Gascoyne’s wrecking amendment, 19 Apr. 1831. He was returned unopposed for Bedford at the ensuing general election, when he again criticized the £10 proposal and stated his objection to the increase in the number of Irish Members, but ‘cordially approved’ of ‘the bill in general’: ‘he was an advocate for reform, and that a reform was necessary, all must allow’.
Polhill voted for the second reading of the reintroduced reform bill, 6 July, and at least twice against adjournment, 12 July 1831. He voted, so he claimed, against the disfranchisement of Downton, 21 July,
During the next few years Polhill, whom Bedford denounced as ‘a profligate, unprincipled fellow’, and Le Marchant described as ‘very dissolute and ill conditioned’, was assailed by financial and personal problems, as he went a long way towards squandering his inheritance.
