Horrocks was brought to Preston by his younger brother John in the early 1790s to help manage his newly established cotton manufacturing business and was soon admitted to a partnership in the thriving and rapidly expanding enterprise.
Horrocks, who was initially classed as ‘doubtful’ and subsequently under ‘Pitt’ in September 1804, voted against the censure of Melville, 8 Apr., but for his criminal prosecution, 12 June 1805, and was listed as ‘doubtful Pitt’ in July. He supported the Grenville ministry, voting for the repeal of the Additional Force Act, 30 Apr. 1806, was returned unopposed in coalition with Lord Derby’s son at the general election and was numbered by ministers among the ‘staunch friends’ of slave trade abolition. He apparently transferred his support to the Portland government after the fall of the ‘Talents’, for at the general election of 1807, when the Preston coalition was unsuccessfully challenged by an independent candidate, he was denounced as a supine supporter of three successive administrations, ‘a man of no education, and consequently of no skill in political affairs’. Other charges levelled against him were that he considered 7s. a week sufficient wages for his weavers and that he had treated a delegation of Bolton weavers who had called on him in London ‘with the greatest contempt and ridicule’. His supporters denied these slurs, and ascribed the low level of wages to the dislocation of the cotton trade by commercial warfare.
Horrocks subsequently voted against government on the Duke of York scandal, 15 and 17 Mar., and Castlereagh’s alleged electoral corruption, 25 Apr. 1809. His only recorded votes during the existence of the Perceval ministry were with them on the Walcheren inquiry, 30 Mar. 1810, shortly after the Whigs had classed him as ‘doubtful’, and against them on a clause of the Regency bill, 21 Jan. 1811. At the general election of 1812, when he and Derby’s nominee fought another successful contest against an independent, he boasted that ‘he could act as independent a part as any man in Parliament’.
Horrocks survived an attempt on his life by a disgruntled cotton spinner in 1823, and two years later was granted a coat of arms incorporating a fret and shuttle, with the motto industria et spe. He died, an extremely wealthy man, 24 Mar. 1842.
