At the time of his election as Liberal MP for Oldham in 1857, James Platt was a partner in ‘the largest machine-making concern in the world’, Platt Bros. & Co., supplying both domestic and overseas markets.
Platt and his brother John took a leading role in the campaign for Oldham to be incorporated as a municipal borough, guaranteeing £100 towards the costs of the campaign.
Platt contested Oldham in 1857 as the running mate of William Johnson Fox, with John Morgan Cobbett as a rival radical candidate. (In 1856, a deputation from Fox’s committee had approached John and James Platt as possible candidates; while John declined, James accepted.
In the Commons, Platt’s interventions in debate reflected his concern for local interests, speaking on the desirability of promoting art in order to benefit manufacturing (he attended the 1857 annual dinner of the Society for the Encouragement of Arts, Manufactures, and Commerce), and on the need for public parks in the north of England.
However, Platt’s untimely death brought a potentially promising parliamentary career to an abrupt end. He was killed in August 1857 while out shooting on the moors at Ashway Gap with his friend, Josiah Radcliffe, mayor of Oldham, who stumbled and accidentally discharged his gun, lodging a bullet in Platt’s leg: ‘the shock was too great for his weakly constitution’.
