Paul Martin returns to explore Queen Victoria's Osborne House. Clare Balding investigates an eccentric Gloucestershire collection, Charlie Luxton visits a lost Scottish ruin, and Richard E Grant uncovers classic films at Pinewood Studios.

Paul Martin visits Mount Stewart in Northern Ireland as its treasures emerge. Clare Balding explores medieval stained glass, Charlie Luxton uncovers Windermere's lost industry, and Nick Hewer celebrates Britain's first aerial photography.

Paul Martin visits Berkeley Castle, where lost Vivaldi compositions are revealed. The team explores the Country Life archive, London's BT Tower, and the wartime story of the Matilda tank.