Having watched this the other day I can confirm it is a marvellously crafted piece of film making. Set in what appears to be a Lego castle supposedly in Scotland this horror film is terrifying. Of course, for all the wrong reasons which are still so right.
Paris is the best actress in it, despite having talent brought in from The Bill in the shape of Ben (one of the officers who died in the Sunhill blaze). I'm sure you'll all be pleased to know that it manages to lack any form of suspence but remains rivetting to the completely random apparently unplanned end.
At its first showing the audience walked out halfway through - a must see.