Blackburne, like his maternal cousin Isaac Gascoyne*, had derived much of his early influence in Lancashire from the Greene interest. A staunch anti-Catholic Pittite and Tory, he had recently tended to support Lord Liverpool’s administration, but independently so. By 1820, when he sought his ninth return for Lancashire, his ‘extremely absent and otherwise odd’ demeanour and intermittent attention to constituency business had become an embarrassment to his friends, and the Liverpool ministry deemed him ‘too old’ to be relied on to defend the conduct of the Peterloo magistrates in the House.
‘Bowed down with grief and affliction’ following the death in January 1823 of both his wife and his brother Thomas, the warden of Manchester Collegiate church, he applied unsuccessfully through his old friend Lord Sidmouth for the wardenship for his son Thomas; but he did secure the lucrative post of distributor of stamps for Manchester for his brother Isaac that year.
Blackburne divided, 6 Mar. 1827, 12 May 1828, and presented petitions against Catholic relief, 14 May 1827, 3 June 1828.
Blackburne died in April 1833 at his London home in Park Street, and was succeeded in his estates by John, Conservative Member for Warrington, 1835-47.
