Alan explores Cragside, a unique estate in Northumberland masterminded and landscaped by the Victorian inventor and pioneering industrialist Lord William Armstrong and filled with the most advanced technical advances of his day. Peter Purves visits Castle Drogo on Dartmoor, Miriam O'Reilly walks through the vast Cragside woodland and Angela Rippon visits the Red House in Bexleyheath, home of William Morris.