A senior member of the British Prime Minister's Conservative constituency has died at the Glastonbury Festival.

It is believed that Christopher Shale, the chairman of the West Oxfordshire Conservative Association, had a heart attack.

His body was found in a portable toilet in the backstage area shortly after 9am.

Mr Shale was believed to have been staying in a Winnebago at the festival.

Later, a police spokesman said: 'The results of the post-mortem combined with the inquiries conducted into the circumstances surrounding the death indicate it is not suspicious'.

David Cameron said he and wife Samantha were 'devastated' by the death of Mr Shale.

The death comes after Mr Shale was quoted in a Conservative strategy document leaked to the Mail on Sunday.

Referring to Tory party membership, he was quoted as saying: 'No reason to join. Lots of reasons not to.'

Mr Shale was the chief executive of Oxford Resources Ltd, a cost reduction company based in Chipping Norton, Oxfordshire.

He was previously chief executive of SGL Communications. He is listed on the website of europsceptic thinktank OpenEurope as a supporter and was a director of the Centre for Policy Studies.