The National Trust is planning to cut 250 jobs in order to offset soaring costs in other areas.
The charity has decided to reduce its wages bill by £6m a year. Its pensions bill has jumped by £8m a year, while NI contributions and insurance charges have also risen.
The charity has already saved 50 jobs, thanks to a recruitment freeze, and plans to cut 200 more through natural attrition and voluntary redundancies - although it does not rule out compulsory redundancies.
It argues that soaring costs have undermined its capacity to invest in core purposes and fears it will be unable to respond to disasters such as the foot and mouth crisis.
Director-general Fiona Reynolds said: "These measures are aimed at giving us the potential for real investment in our core objectives, better serving members of the public and safeguarding the interests of the 96 per cent of our remaining staff."