Biddle took sole charge of the Alfredians in May 2020 following the departure of Tom Austin.
The pair had originally been appointed as joint bosses in June 2019.
Both were former Wantage players. Biddle is local and had relatively recent experience of playing at the Southern League level.
As well as Wantage, Biddle also played as a central midfielder for Abingdon United, Willenhall Town and Market Drayton Town, but his playing career was unfortunately cut short due to a triple ACL injury.
He has coaching experience in America and assisted at Hellenic League side Milton United.
Biddle has been a valued member of the club for the last four seasons and has been an asset to the club, who have placed on record its thanks to him for all his time and commitment that he has put into the club as manager and committee member.
Biddle will now take some time away from the game.
First-team coach Jack Wells has also made the decision to stand down.
Wells joined the Freds at the start of this season and has been a fantastic addition to the coaching staff.
Assistant manager James Keller has now been appointed as manager and further announcements are expected within the coming days regarding a new assistant manager and new coach.
Keller`s first game in charge will be at home this Saturday against Biggleswade FC.
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