In case anyone needs a room, they are doing this deal again (started today). Site seems to have calmed down now - you couldn't get on it this morning.
They even have rooms on christmas day if you can't stand staying with the rellies. I have considered it, but I think it would be just a little bit too depressing to spend christmas night in a bland hotel room with DS driving us round the bend....
I've been contemplating this since I first saw your post last week. This morning I finally booked a family room in Gt Yarmouth for the 21st Dec for kids and I as a christmas treat and to go visit Santa.