Children's novelist Sir Michael Morpurgo and his wife Clare will officially unveil a book vending machine at Exeter St Davids on Friday (April 21).

The Penguin Books machine has been a big hit since its introduction at the station last month, selling more than 200 books.

Representatives from Penguin Books, Exeter UNESCO City of Literature, Great Western Railway and Graddon Vending will speak at the event, before Clare and Sir Michael cut a ribbon to mark its official unveiling.