Penelope Keith explores a medieval masterpiece in the Kent village of Penshurst. On the Norfolk coast, Alex Langlands meets the volunteers keeping Mundesley's beaches ship-shape. Juliet Sargeant has a go at building a traditional wall in Haddenham. And in the New Forest, Patrick Grant falls under the spell of the ancient village of Burley. Which village will be selected to make it through to the semi-finals?