Hidden Treasures of The National Trust (59.10)  https://www.bbc.co.uk/iplayer/episode/m001ltts/hidden-treasures-of-the-national-trust-series-1-episode-1 

A painting’s hidden story is revealed, a beautiful Chinese bridge is painstakingly rebuilt, and a 450-year-old table must be saved from collapse and made ready to go on tour.