Plot: George visits the majestic 1,000-year-old Dunster Castle in Somerset, once home to a clan who spent six centuries renovating it from fortress to family home. He discovers it's not size that matters at the country's finest surviving 17th-century water gardens, Westbury Court in Gloucestershire, and goes back to his roots in Tyne and Wear at Washington Old Hall, the ancestral home to the first president of the USA