Horner attended Seaton Burn School and joined the football development programme at Tyne Met College.
[2] Horner signed his first professional contract with Hibernian in January 2010 and made his first team debut as a substitute against Inverness CT on 11 May 2011.
[3][4] He was loaned to Scottish Third Division side East Stirlingshire in November 2011[5] and made his debut the following day against Berwick Rangers.
[9] At Blyth, Horner earned a call up to the England C squad, from manager Paul Fairclough, for a fixture marking the Northern League's 125th anniversary.
[17] Despite an impressive few months back at Blyth, Horner fell out of favour with Manager Alun Armstrong and failed to reestablish himself in the team.