At the time of his death in 1872, John Platt was ‘the head of one of the largest and most important industrial firms in the world’, and was regarded by the Daily News as ‘one of the most earnest and consistent Liberals’ in the Commons.
Alongside his engineering interests, Platt served as chairman of the Oldham, Ashton and Guide Bridge Railway, and as a director of the London and North Western Railway Company (1862-7), the Indian Branch Railway and the Ebbw Vale Iron Company.
Platt constructed a mansion at Werneth Park, Oldham in 1847 at a cost of £10,000, to which he added a country estate at Ashway Gap, Saddleworth in the early 1850s, purchased in conjunction with his brother James.
Platt was an equally generous benefactor in Oldham, taking a particular interest in technical education. He set up a works library (1848), constructed the Oldham School of Science and Art (1865), and assisted with the establishment of the Werneth Mechanics’ Institute, opened by Gladstone in 1867.
Notwithstanding his subsequent support for the Crimean war, Platt had long allied himself with the Manchester school and saw himself as a disciple of Richard Cobden.
At the bitterly fought 1847 election, with Oldham’s Liberals divided over the decision to run John Morgan Cobbett in conjunction with John Fielden, Platt seconded William Johnson Fox’s nomination as a rival candidate, and assumed the leading role in Oldham’s Liberal politics thereafter.
Platt’s extensive business concerns may explain why he is only known to have made one parliamentary speech before 1868; his firm’s transformation into a limited liability company in that year may have afforded him more time for his parliamentary duties thereafter.
Platt died in Paris in May 1872, having been taken ill at Turin during a continental tour.
