[1] As a youngster, Blewitt was associated with Norwich City, but joined West Ham United while still at school and came through their academy system.
[3] However, his debut in the Football League was also the only appearance he made in Southend's first team, as an 89th-minute substitute in a 3–0 win away to Cheltenham Town.
[6] His stay was brief: he left following a change of management,[7] made one appearance for Enfield Town,[8] then, in September 2008, joined Brentwood Town,[9] where he won both Manager's and Players' Player of the Year awards for the 2008–09 season.
[10] After Brentwood dismissed manager Carl Griffiths at the start of the 2009–10 season, Blewitt moved to Aveley.
On 28 March 2016, Blewitt played in former West Ham United teammate Mark Noble's testimonial at the Boleyn Ground.