Generous Tennant donates 'Dr Who' script

Tennant with Billy Piper

David Tennant has donated his script from the first episode of this series of Doctor Who to charity.

The Scottish actor gave up the document for Christian Aid's annual book sale in Edinburgh's St Andrew's and St George's Church.

Attracting thousands of books and customers every year, other gems at the event include a signed copy of the last work by late author Muriel Spark.