A £30m budget gap may force one of the biggest NHS trusts in Wales to cut back on beds and reduce the number of agency staff drafted in to fill full-time vacancies.

Abertawe Bro Morgannwg University Trust will adopt a “robust programme”, which is understood to include a recruitment freeze but no compulsory redundancies.

Eifion Williams, ABM University Trust’s director of finance, told board members the organisation’s financial position was “very concerning”.

He said: “A review of staffing levels over the past six months has shown that in overall terms there has been a small increase in staffing levels, which is at odds with having to reduce costs.

“In terms of beds, the directors of operations, planning and finance have met with the general managers concerned to ensure there is a robust programme of bed closures where temporary additional beds have opened.”

ABM, which was formed last year by the merger of Swansea and Bro Morgannwg trusts, has a budget of more than £770m. It will be axed next month when a new integrated local health board is created.