I went here a couple of months ago for my 40th Birthday, stayed in the Red Room. My review is on Trip Advisor too, and I rated Excellent.
I had initially been put off by the stealing thread nonsense. I have to say you would be insane to try and steal the toiletries, they are clearly part of the fixtures and fittings in the bathroom.
It was one of the nicest hotels I have ever stayed in. The Red Room was utterly luxurious and very romantic, it was huge and has it's own private courtyard garden. I understand the other rooms are just as nice but all are individually styled. I like the look of the Opium Room too.
The staff and service were all excellent, logs for our fire we delivered within a minute of us requesting them. Attentive but not intrusive.
The food was out of this world, although some reviews on Trip Advisor really criticise it, I loved every meal I had, it was quite adventurous cooking, but totally delicious. There is a little warning asking you to avoid eating at Peak times of day if you don't want to wait - this suited us. Even when we did have to wait, it was for no longer than you would in any other restaurant cooking to order.
I would recommend the hotel, but be aware, the town of Swaffham is pretty run down. Luckily, it is only a short drive to the gorgeous North Norfolk coast.