After a spell coaching at
Bromsgrove Rovers, Gardiner returned to their Worcestershire neighbours
Redditch United for his first management job. In spite of challenging times financially, he guided the club to the fourth qualifying round of the
FA Cup and helped to develop a number of players including striker
Matt Smith who went on to play for
Oldham Athletic,
Leeds United,
Fulham,
Queens Park Rangers and
Millwall. He left in February 2011 when the playing budget was cut to zero and linked up with
Worcester City – first on the scouting side and then, in May 2011, as assistant manager to Carl Heeley. Over the next few seasons City made a name for themselves as non-league giant-killers in the
FA Cup, knocking out a number of Football League sides. In 2014–15 they beat League One club
Coventry City at the Ricoh Arena before losing to another League One side
Scunthorpe United 14–13 on penalties – a record for the longest shoot-out in FA Cup history. He was appointed joint manager alongside Heeley the following season and another FA Cup run ended in a first round defeat at Bramall Lane against
Sheffield United. Gardiner's ability to develop players continued at City with defender
George Williams joining League One side
Barnsley. The start of the 2016–17 season saw Gardiner named head of coaching at
Kidderminster Harriers, the first appointment of new manager
John Eustace. Gardiner explained that the chance to continue his player development work on a full-time basis was key to his decision. He had a chance to further enhance those skills in the summer of 2017 when he worked alongside former
QPR manager
Chris Ramsey at the
V9 Academy founded by England international
Jamie Vardy. In June 2018, Gardiner linked up with
QPR with the remit of nurturing the younger squad members while developing his own skills under the guidance of manager
Steve McClaren and assistant Eustace who had moved from Harriers the previous month. As assistant coach he helped with the development of emerging players including
Eberechi Eze,
Darnell Furlong and
Bright Osayi-Samuel. From May 2019 he was part of
Mark Warburton's backroom team. Gardiner and Eustace left QPR in June 2022 after Warburton was replaced by
Michael Beale, and when Eustace became head coach of
Birmingham City a couple of weeks later, Gardiner was appointed as one of his two assistants. He left the club on 10 October 2023 after Eustace's dismissal. In February 2024, he reunited with Eustace again when appointed as an assistant head coach at
Blackburn Rovers. Eustace changed jobs to manage
Derby County 12 months later and Gardiner followed him to
Pride Park Stadium to become his assistant head coach. ==References==