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.

In this special edition Antiques Roadshow to mark the coronation of King Charles, we take a look back through the archives at some of the most intriguing artefacts with royal connections that have appeared on the programme.

Fiona Bruce gets a peek inside Westminster Abbey where coronation preparations are in full swing, while the team see brand new items with links to royalty in the stunning grounds of Fulham Palace.

Pictures specialist Frances Christie does a spot of stamp collecting with Chris Taft from the Postal Museum and gets the chance to see a sheet of brand new Charles III stamps – as well as a sheet of rare Penny Black stamps with an eye-watering value.

Ceramics expert Serhat Ahmet offers some tips on the most collectable coronation keepsakes and meets a collector with a rare set of coronation mugs that first appeared on the Antiques Roadshow 25 years ago.

Fiona Bruce is intrigued by a collection of coronation souvenirs from the past that have been preserved in the Museum of Brands, such as crisp packets, a 1953 cut-out-and-keep coach from the back of a Shredded Wheat packet and a 120-year-old chocolate bar commemorating the coronation of King Edward VII.

There are also precious items with a direct link to the royal family, including a document signed by Queen Elizabeth I and a gold bracelet given by Queen Victoria to one of her ladies-in-waiting. And we revisit some of the more unusual royal treasures that have turned up on the Antiques Roadshow in the past, including a royal toilet seat from Osborne House, a pair of Queen Victoria's knickers and an x-ray of King Edward VIII's hand.