If you live in London, or you are heading up to London to do a bit of Christmas shopping, stop by, if you can, La Fromagerie in Marylebone High Street.
Their cheese room alone is worth a visit, just to gawp. When I was there last week, tourists were taking photos of it. But at the moment, it's a doubly exciting place because they are making on site a really extraordinary cheese, which is a Brie with a layer of truffle inside.
Normally I think that that kind of thing - foie gras wrapped in veal, truffles in gold soup, caviar on a bed of crushed diamonds - is sick-making and gross, but this cheese gets away with it by being the most delicious and also unusual thing I've had since I ate that banana and peanut butter sandwich.
Monstrously expensive and you have to ring ahead to make sure they've got some in stock, but well worth it if you're looking for something a bit different for Christmas lunch.