Documentary: George Clarke’s National Trust Unlocked, 4Seven, 9.30pm

Intrepid George ( left) visits one of the National Trust’s quirkiest buildings in Devon – a bear hut on the 6,400- acre Killerton estate. The main house was given away many years ago because of the socialist ideals of the aristocratic family who lived there. The presenter also unearths secrets and scandal at Baddesley Clinton Hall, a fortified Tudor manor house in Warwickshire where in the past the architecture has meant the difference between life and death. Later, he heads home to the north- east and takes a stroll through Gibside Estate, a landscaped park with royal connections and crowned with jaw- dropping architecture.