The Last of the Uzkoks - S6.E6

Lovejoy is called in by Lord Dunwich to value a silver communion set, and Lady Dunwich wants him to find her some antique prints of the lost town of Dunwich-by-the-Sea (which is now under the sea). Charlie has done a moonlight flit, leaving his old dad in charge of Felsham Hall, and there are some unlikely characters around - a mad Greek priest, a Dutch civil servant, and a strange woman...