The 2005–06 season was the 91st in the history of the Isthmian League, which is an English football competition featuring semi-professional and amateur clubs from London, East and South East England. It was the last season in which the Isthmian League consisted of three tiers. At the end of the season Division Two was disbanded, and most of the Division Two clubs were distributed between lower level leagues, while Division One was divided into Division One North and Division One South. Premier Division The Premier Division consisted of 22 clubs, including 14 clubs from the previous season and eight new clubs. Two clubs relegated from the Conference South: Margate Redbridge Three clubs promoted from Division One: AFC Wimbledon Bromley Walton & Hersham Three clubs promoted from Southern Football League Division One East: Fisher Athletic East Thurrock United Maldon Town Braintree Town won the division and were promoted to the Conference South along with play-off winners Fisher Athletic, who earned a second consecutive promotion. Maldon Town, Windsor & Eton and Redbridge were relegated, while Hendon were initially relegated too as the worst 19th-placed club among the seventh level leagues, but were reprieved after Canvey Island resigned from the Conference. League table Top scorers Play-offs Stadia and locations 1.Chelmsford City spent start of the season groundsharing with Billericay Town before returning to Chelmsford at January. Division One The 2005–06 season was the last of two seasons in which the Isthmian League consisted of a single Division One. Division One consisted of 23 clubs, including 17 clubs from the previous season and six new clubs: Dover Athletic, relegated from the Premier Division Kingstonian, relegated from the Premier Division Lymington & New Milton, promoted as champions of the Wessex League Ramsgate, promoted as champions of the Kent League Tonbridge Angels, relegated from the Premier Division Walton Casuals, promoted as champions of the Combined Counties League Ramsgate won the division and were promoted to the Premier Division along with runners-up Horsham, and play-off winners Tonbridge Angels who returned to the Premier Division at the first attempt. There was no relegation from the division this season, though Banstead Athletic resigned from the league at the end of the season. At the end of the season Division One North and Division One South were created to replace Division One. Most of the clubs remaining in the division were transferred to the new Division One South. League table