Blanchett had a two-week trial at Liverpool starting in February 2007 and the Premier League club considered a transfer for the player, who was rated between £25,000 and £50,000. Having made 24 appearances for City in 2006–07, Blanchett was signed by League Two club Peterborough United for an undisclosed fee on 19 March 2007. His debut came on 9 April 2007 as an 89th-minute substitute for George Boyd in a 2–0 home win over Mansfield Town. His first goal for the club came on his third appearance with a 22-yard shot, playing the second half of a 3–3 home draw with Rochdale on 5 May 2007. The 2007–08 season saw him make his first start for the club, in a 9 October 2007 Football League Trophy tie with Milton Keynes Dons at Stadium mk. Milton Keynes won 3–1. He made his first league start against Macclesfield Town on 23 February 2008. He was deputising for Jamie Day, who had injured his back before kick-off, Peterborough winning 3–0. Indeed, he made just two appearances for the promotion-winning League Two team that season and was placed on the transfer list in May 2008. He made just three League One appearances and also played one FA Cup match in 2008–09, before again being transfer listed in May 2009. In July 2009, he joined Port Vale for pre-season training. He played 90 minutes for Vale in what turned out to be a pre-season friendly defeat, Vale losing 1–0 to Biddulph Victoria of the Midland Football Alliance. On 7 August 2009, Blanchett joined Conference Premier club Stevenage Borough on a one-month loan, but did not make any first-team appearances. Blanchett joined League Two club Hereford United on 17 September 2009 on loan, making his debut two days later in a 2–0 victory at home to Accrington Stanley. He was played out of position at centre-back, but following the game said "Centre-back isn't my usual position - I've played left back all my life - but I find it quite comfortable". He stayed on loan with Hereford until December 2010, making 16 appearances. In January 2010, he joined Conference Premier club AFC Wimbledon on loan until the end of the season. He finished the loan with 12 appearances and after returning to Peterborough was released on 30 April 2010.
He signed a one-year contract with League Two club Crewe Alexandra on 23 July 2010 after a successful trial. Despite making 44 appearances in 2010–11, he was released by Crewe on 12 May 2011.
Following his release by Crewe, Blanchett began training with Championship club Derby County at the start of July 2011. He signed for Burton Albion of League Two on 30 July 2011 on a one-year contract. He was released on 8 May 2012 after making 16 appearances in 2011–12.
Blanchett signed for newly promoted League Two club York City on 2 July 2012 on a one-year contract. He made his debut in York's 2–2 draw away to Morecambe on 21 August 2012. Having made four appearances for York, he was released by the club on 24 January 2013 after his contract was cancelled by mutual consent.
Later career
On 30 January 2013, Blanchett returned to Cambridge City, now playing in the Southern League Premier Division, on non-contract terms for the remainder of 2012–13. Blanchett signed for Conference South club Havant & Waterlooville on 26 June 2013. On 27 May 2016, Blanchett become new manager Rod Stringer's first recruit, alongside fellow former Havant & Waterlooville teammate Shamir Mullings, for National League South club Chelmsford City. After departing Chelmsford at the end of the season, Blanchett signed for Hayes & Yeading United ahead of the 2017–18 season. After starting in Hayes' first seven games in all competitions of the season, Blanchett left the club.
