Organisers of a charity event are looking for fools without horses to do a circuit at Blenheim Palace.

The Anthony Nolan Bone Marrow Trust wants 500 volunteers to take part in this year's The Only Fools Fun Run as part of the Blenheim International Horse Trials.

The September 10 event, which last year raised 25,000, pits runners on a four-mile cross country run, clambering over horse jumps, slithering down grassy banks and splashing through a lake.

Events manager Paul Rushton said: "This year we aim to increase on last year's 25,000, which will make a big difference in our fight against leukaemia."

Adventurous volunteers, over the age of 14, wanting to take part should call Mr Rushton on 01865 875758.