SERIES PREMIERE: I visited London not too long ago, and spent some of that time watching some very strange programs on British television. This time around, my favorite shows were the ones devoted to coverage of the game of darts – but there were plenty of other weird contenders, nearly as compelling. This new import, known there as The Great British Bake Off, is a perfect example: It’s a baking competition, but done with a peculiarly British flavor, an ingredient you can’t fake if you try repeating the recipe in America. So here, thanks to PBS, is the original. Check local listings.