Pretty much as it says on the tin :)
The same as these: http://www.tesco.com/groceries/Product/Details/?id=262320018
But when I went into my nearest Tesco (Birmingham), they were reduced from £1 to 25p :)
Maybe not to everyone's liking, but they're tasty stuff, and you won't find a box of them much cheaper than 25p.
They were in the Christmas(/general?) clearance section (though there's nothing at all festive about them), so it may be store specific. Worth a look, though :)