The characters of the episode briefly visit London, and find it deserted due to the events of "The Runaway Bride" and "The Christmas Invasion" causing people to stay away from London that Christmas. Mr Copper, an alien historian from Sto, has a degree in "Earthonomics" and makes dubious claims about the Christmas traditions celebrated by humans in the United Kingdom (whose monarch is apparently Good King Wenceslas, though the episode later shows Queen Elizabeth II as resident of Buckingham Palace) such as the dish of turkey for Christmas dinner, Santa and Mary.