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Devonshire's made his debut for West Ham on 27 October 1976 in a League Cup tie against Queens Park Rangers, in which West Ham lost 2–0.4 He made his League debut three days later on 30 October 1976 against West Bromwich Albion, where he played in a 3–0 defeat. He scored 29 goals in 345 full (and 13 substitute) appearances.
He collected an FA Cup winner's medal in 1980, when the Hammers (then a Second Division club) beat favourites Arsenal 1–0 at Wembley. He collected a Second Division title medal the following year as the Hammers won promotion, and was still a very integral part of the side when they finished third in the league in 1986, just two places and four points short of what would have been the club's first ever top division title – an accolade that the club has yet to achieve 27 years later.
He remained at Upton Park until 1990, a year after the Hammers were relegated to the Second Division, and then signed for Watford, where he played for two years before retiring as a player in 1992. He had played a total of 446 competitive games for the Hammers over 14 years, scoring 32 goals.5
As manager of Hampton & Richmond, he took the club from Isthmian League Division One South to the play-off-final of the Conference South. In his first season he guided them to fifth place in the Isthmian Division One South which due to re-organization of the leagues was enough to see the club promoted to the Isthmian League Premier Division. He then guided the club to a sixth placed finish in their debut season at that level missing out on the play-offs on goal difference on the final day of the season. The 2005–06 season would see Devonshire take the team into the play-offs. Having won a dramatic play-off semi-final on penalties away to Heybridge Swifts the team then faced Fisher Athletic away who beat Hampton 3–0. Devonshire finally managed to get Hampton & Richmond Borough promoted the following season in style by bringing the Isthmian Premier Division title to the Beveree. In their debut season in the Conference South he has managed to guide his team to third place in the league and into the play-offs for the Conference National.
On 23 May 2011, Devonshire was appointed the manager of newly promoted Conference National club Braintree Town.6