Given TruffleShuffle's status, I'm assuming this is licensed. Previously, to my knowledge, the only way to get licensed merchandise like this was via David Rowe's Zazzle shop. Indeed, the 'exclusive' black T-shirt on TruffleShuffle, using the Labyrinths of Fear dungeoneer artwork, is very similar to the one on Zazzle.
Putting 'I survived Knightmare 1989' on the mug is an odd decision. There are only four people who could legitimately own it i.e. Chris, James, Alex and Tim from Series 3 Team 12.
Then again, had they put this on the mug -
- I might have sought legal advice.
Where the Zazzle shop refers to the 'Fright Knight', TruffleShuffle calls it 'Armoured Knight'.
The doormat is a nice idea (though perhaps not one for the immediate future). When first promoted, it was going to say 'Welcome Dungeoneer', but they saw sense and changed it to 'Enter, Stranger'.