Antiques Roadshow visits the Bishop's Palace, a site of special religious significance for over 800 years in the heart of Wells in Somerset.On a hot summer's day, Marc Allum reveals that a modest Delft plaque from a Bristol pub, decorated with a drinking song by composer Henry Purcell, could be of national importance – with a value to match.Lawrence Hendra admires a portrait of an unknown First World War army officer that was salvaged from a skip, and Geoffrey Munn is transfixed by a group of Victorian mourning rings that contain woven strands of the hair of the departed.Jewellery specialist Joey Hardy is dazzled by a brooch and earrings designed in the 1940s by Cartier, while Lennox Cato meets the Bishop of Taunton and gets a rare chance to see the fabled 16th-century Glastonbury Chair.The team are also excited to see a collection of movie memorabilia, including rare posters for movies such as Alien, while Chris Yeo challenges Fiona to identify the ‘basic, better and best' from a group of objects by Finnish designers.