League Two. Peterborough United 2011–12 season On 21 February 2012, Barnett signed on an emergency loan deal for Championship side Peterborough United, with a permanent move worth £1.1 million agreed for the start of summer transfer window. Four days later he came off the bench to score on his debut in a 1–1 draw at Doncaster Rovers. After the match, manager Darren Ferguson described Barnett's goalscoring debut as one of the best he had witnessed. Two weeks later, on 10 March 2012, Barnett had scored three goals in three consecutive matches, bringing his tally to four. At the end of the 2011–12 season, Barnett joined Peterborough United on a permanent basis. 2012–13 season Barnett endured a poor start of to the 2012–13 season as he suffered a hamstring problem, meaning he missed the first three matches. After his return against Birmingham City, Barnett made a reckless challenge on Greg Cunningham during a 2–1 defeat to Bristol City, which resulted in Cunningham being stretchered off; Barnett was booked rather than sent off – much to City manager Derek McInnes's frustration. Barnett scored his first goal of the 2012–13 Championship campaign with a header at Barnsley on 2 October, ending five games without scoring. On 12 November, Barnett was transfer-listed, along with three other players, after breaching club discipline rules during an unsanctioned night out. Barnett and Nathaniel Mendez-Laing also received a police caution following the incident. Shortly after being transfer-listed, he joined Ipswich Town on loan until January 2013. Ipswich manager Mick McCarthy said that "the scouting reports have all said if you can get him until January he will be excellent." However Barnett's loan spell ended after three appearances when he suffered a knee injury during training on 13 December. After returning on loan from Ipswich Town, Barnett continued to be left out of the Peterborough squad due to injury, but by mid-February manager Ferguson had forgiven Barnett and allowed him to make a return to the first team. Barnett found himself playing a smaller role in the first team, spending time on the bench in several games. Peterborough were relegated from the Championship to League One at the end of the 2012–13 season, and Barnett was placed on the transfer list by the club, along with four players. 2013–14 season Barnett made his first start in over six months in the opening game of the 2013–14 season, a 1–0