A foundation trust has suspended the last executive director remaining in post from the tenure of its previous chief executive, HSJ has discovered.

Sue Green, director of human resources and organisational development at the Wirral University Teaching Hospital Foundation Trust, has been suspended since the start of October and is subject to an investigation by the trust.

She was suspended by chief executive David Allison who since joining the trust in April 2012 has seen the entire executive board of directors depart.

The trust refused to confirm the reasons for Ms Green’s absence. Ms Green, who was HR director since 2008, also declined to comment.

After HSJ made initial enquiries about her suspension, an email was sent to all staff on behalf of Mr Allison by communications and manager Barbara Crampton on 25 October.

The email, obtained by HSJ, referred to Ms Green’s “absence”. It made staff aware of media interest and reiterated that the trust would not be making any statement.

Ms Green is the last of the executive directors to have served under former chief executive Len Richards, who left his post in August 2011.

Since Mr Allison took on the position in April 2012 all executive directors at the trust have left.

In March 2012, Monitor found the trust in significant breach of its licence after “persistently failing” the 18 week waiting time target. It also had concerns about the way the board was run in relation to addressing poor performance within the trust.

In February this year Monitor said there had been “significant improvements” and the trust was no longer in breach of its authorisation.

In a statement the trust said it did not consider the changes at executive level to be unusual, adding that it was a “mark of overall quality” that directors had moved on to more senior roles in other organisations.

It added: “We do not have any concerns relating to ‘corporate memory’ as appropriate succession arrangements were implemented. Also, there have been no changes to the posts of chair and several senior non-executive directors for some time.

“Over the last 18 months the trust has achieved significant improvement on all external quality measures and demonstrated improvements in all key performance standards. We believe this is testament to the leadership provided by both past and present executives during this period.”