Valuable paintings are among the items needing restoration

A survey by English Heritage uncovered a long list of structural and cosmetic problems needing attention.

The roof and walls would cost about �2.5m to repair - money is also needed for restoring valuable paintings.

The Grade One listed building, which dates back to the mid-12th Century, has been the home of the Berkeley family for 25 generations.

'Long process'

"We need to do work to the battlements, stonework, interior, some of the roofs and timberwork," said Charles Berkeley.

"Painted decorations in the morning room need to be looked at and every day things like drain pipes, window frames, masonry.

"We're looking at over �5m worth over time, it's going to be a long process."

The fundraising effort is being launched on behalf of the castle trust by Prince Michael of Kent, on Monday.

"We're not cash rich and there is a need to maintain the building," said Mr Berkeley.

"And I think for a building of such importance, we need all the help we can get really."