Antiques Roadshow, 'Falmouth National Maritime Museum 3', 9Gem, 14:50, Wed, 18 Dec
This looks like a repeat, too, and also a non-existent episode. The Wikipedia list of Antiques Roadshow episodes shows Falmouth National Maritime Museum, Cornwall 1 and Falmouth National Maritime Museum, Cornwall 2 as being originally broadcast by the BBC in 2012, and also it doesn't show any Falmouth National Maritime Museum, Cornwall 3 episode.