Despite this background, Seddon did not perform well at school, and was described as unruly. Despite his parents' attempt to give him a classical education, Seddon developed an interest in engineering, but was removed from school at age 12. After working on his grandfather Richard's farm at Barrow Nook Hall for two years, Seddon was an apprentice at Daglish's Foundry in Sutton. He later worked at Vauxhall foundry in Liverpool, where he attained a Board of Trade Certificate as a mechanical engineer.