Handcock sat for Athlone on his family interest from 1783 and supported government, though Jonah Barrington blacklisted him for the following reason: ‘He made and sang songs against the Union in 1799 at a public dinner of the opposition, and made and sang songs for it in 1800’. Handcock became a privy councillor and sole proprietor of Athlone at the Union, and on 24 June 1801 requested sole patronage of the borough from the Irish government, claiming to be their ‘strenuous supporter ... upon every occasion’. On 10 Nov. 1801 he applied to be a governor of the county, for which he had been returned in a contested election in 1790 but unseated on petition, ‘to give him weight with the justices’, merely as a ‘feather’. This impracticable request was renewed on 23 Mar. 1802 and 1 Feb. 1803.
Handcock made no mark in Parliament. On 4 Mar. 1803, on the division for an inquiry into the Prince of Wales’s debts, he appeared both for and against in a scratch Castle list: the comment against his name on the minority list was ‘like him’, and on 6 Mar. the chief secretary wrote ‘What have we to say to Handcock?’, so it seems that he did vote on that side.
