A RARE 325-year-old letter written and signed by Sir Christopher Wren, who was born in East Knoyle, has been sold for £19,200 at auction.

The amount is more than double the sum it had been expected to fetch.

The letter was written by Sir Christopher in or around 1685 to 1686 to Northamptonshire landowner, Sir William Fermor, giving advice on the design and building materials for his proposed home.

Before the auction at Bonhams in London, the letter had been expected to sell for between £7,000 and £9,000.

It was bought by a mystery bidder.

The auctioneers say so-called autograph letters by Sir Christopher Wren are "very rare”.

Sir Christopher was born at East Knoyle on October 20, 1632. His father, Christopher Wren senior, was the rector of East Knoyle, while his mother, Mary, was the daughter of Richard Cox, of Fonthill.