Seddon grew up moving around the south west of England, living in Devon from age 11. Seddon attended Colyton Grammar School. Instead of going on to formal university, Seddon took various courses with the Open University. She later completed a Master of Arts (MA) at Kingston University in 2023. She has also lived in London, Amsterdam and Kent.
Seddon began her career as a freelance journalist before creating a music news website. She met her future husband, James, who was a writer for the website. She then moved from Birmingham to London where she worked as a journalist for Daily Mail Online. She then worked for The Sun before returning to freelance journalism. She published her first novel in 2016. She hosts the Honest Authors Podcast alongside Gillian McAllister.
