At this exact moment, there are two things on television. At the same time, on the same channel. One is the pre-Christmas edition of Top of the Pops, which sees Boney M performing "By the Rivers of Babylon", but also - by a further splitting of universes, which even the CEO of an American comic-book company would find hard to sell - perfoming "Mary's Boy Child" simultaneously. The other programme is the festive repeat of "Pyramids of Mars", being delivered in one large seasonal package instead of the original four....
