Having served an apprenticeship as a grocer, he spent ten years working as a commercial traveller.
[3] He subsequently became the delegate of the St Helens branch of the National Amalgamated Union of Shop Assistants, Warehousemen and Clerks.
[2] He held the seat at the subsequent general election in January, 1910, but was defeated by 144 votes in the December 1910 poll.
[2] At the 1918 general election Seddon successfully contested the Hanley constituency for the NDP, becoming one of the new party's nine MPs.
[1] Seddon's parliamentary career came to an end in 1922: along with the other NDP MPs he lost his seat at the October general election, despite campaigning as a "National Liberal".