Keith Webb was a central defender in the Norwich City youth side of 1980 but was not considered good enough to be offered professional terms. He worked for the club in an administrative role whilst studying for his coaching qualifications. In 1986 he became manager of Norwich City's Youth team - a team that has produced many stars have generated million pound transfer fees (Chris Sutton, Ruel Fox, Darren Eadie, Andy Johnson, Keith O'Neill, Danny Mills, Craig Bellamy and Robert Green).

In January 2000, Keith was promoted to reserve team manager at Norwich following the promotion of Steve Foley to become first team coach under new manager Nigel Worthington.

In December 2006, Keith was appointed as the new manager of Kings Lynn following Tommy Taylor's departure to join the coaching staff at Peterborough United. He signed a two and a half year deal at the Walks. He departed with Peter Grant's blessing as shown by quickly arranging the loan signings of City youngsters Andrew Cave-Brown and Andrew Fisk. "I left on very good terms and I would hope we can foster good relations between the clubs. Peter said if I ever needed loan players he'd look favourably on us and give me any assistance where he can". Grant said "Keith knows the way I work, he knows what I expect from the players and that's the only reason I am allowing them to go."

In his first full season at Kings Lynn, he led the club to the Southern League title which was secured on 26h April 2008 with a 2-0 win at Merthyr Tydfil. His squad includes Scott Howie, Greg Crane and Danny Bloomfield whilst Craig Fleming, Shaun Carey and Phil Mulryne also played for the Linnets duirng the 2007/8 season

At the end of Lynn's first season in the Conference North, they finished 17th but were demoted to the Southern League as their ground did not meet Conference standards. Faced with uncertain finances, Webb and his assistant Lee Glover resigned at the end of the 2008/9 season.