Antiques Roadshow visits one of the grandest houses in Wales, Powis Castle.Wayne Colquhoun examines a collection of memorabilia from the 1966 World Cup that belonged to Hugh Johns, the ITV commentator who covered the famous final. Serhat Ahmet admires a dramatic porcelain sculpture of a lifeboat crewman, while Alexandra Aguilar challenges Fiona to put a collection of exquisite Japanese items in order of value.Mark Smith hears the story of a father and son who both spent time in the polar regions and sees a medal awarded for the lifesaving rescue of a man who fell into a crevasse. Lisa Lloyd admires rare Bergman bronze figures depicting Arab horsemen, while John Foster stuns the owner of a huge collection of gold sovereigns with a surprising value.Runjeet Singh, a specialist in Asian arms and militaria, tells Fiona about one of his heroes – Tipu Sultan, the 18th-century Indian ruler known as the Tiger of Mysore – and how precious objects from his treasury ended up in Powis Castle after they were looted by British troops.