[4] Barber made his second debut for Peterborough on 17 August 1991, keeping a clean sheet against Preston North End in a 1–0 victory.
[4] In the following season, despite Peterborough finishing bottom of the Second Division, Luton Town made a £25,000 offer for Barber, and he transferred in August 1994,[2] ending his Posh stay with 63 appearances in three years.
Barber had also been working at West Bromwich Albion as a coach until this point alongside Bryan Robson, but fully committed himself to Wanderers in 2004.
[8] Barber was instrumental in the development of Finland goalkeeper Jussi Jääskeläinen, who joined the club in 1997, making his international debut in 1998.
[8] In 2007, Barber joined Nigel Worthington as a coach for the Northern Ireland national football team alongside his role at Bolton, where he would spend five years.
[8] He subsequently joined Bury under Kevin Blackwell on 4 October 2012,[10] before being reunited with Worthington after being appointed assistant manager at League Two club York City on 4 March 2013.
[9] In January 2015, Barber moved to Crewe Alexandra as the goalkeeping coach, after holding a similar role at Burton Albion.