A ‘moderate man, of philanthropic character and popular prepossessions’, Leatham came from an old Quaker family originally settled near Malton, North Yorkshire.
Leatham succeeded his father at the bank, his older brother John Arthington Leatham (d. 1857) having pursued a career at the bar,
Involved in Wakefield elections from 1832, Leatham became prominent in local Liberal politics, seconding their candidate at the nominations in 1837 and 1841.
Leatham retired from banking in 1851 and moved from Wakefield to Hemsworth Hall, near Pontefract, which he had purchased two years earlier.
At the 1859 election Leatham was more forthcoming in his advocacy of parliamentary reform, although not to the extent proposed by his brother-in-law Bright, suggesting that ‘if you find me differing from him you must make allowance for a fellow who lives in the country’.
Concerns that bribery had been extensive prompted a royal commission inquiry at Wakefield, where Leatham testified that ‘things were kept from me systematically which have since been made very plain’.
Leatham’s political rehabilitation began with the presentation by 3,762 Wakefield non-electors in July 1862 of a silver centrepiece, and an address sympathising with his ordeal. He admitted that ‘no one regrets more than I do that that mode of retaliation was adopted, by which bribery was check-mated by bribery’.
Leatham consistently divided with his party against church rates and university tests, and supported Gladstone on the Irish church, 3 Apr. 1868. He is not known to have served on any select committees. Although an irregular contributor to debate, he supported the Liberal reform bill, 13 Mar. 1866, praising the savings bank franchise.
Leatham did not seek re-election in 1868 for ‘family reasons’, but continued his involvement in local affairs, being appointed deputy chairman of the West Riding quarter sessions in 1870, and serving ex officio on the Hemsworth board of guardians.
