Andrew Coles showed off a puzzle lock he had designed and made at the last MPP (Wow! That seems such a long time ago now). Those who played with it were wildly enthusiastic and encouraged him to make it generally available. Andrew has been a busy man - he's produced a bunch and set up a web store and they are available to order now. I've not yet had time to play with mine but what I can tell is that the quality is superb!
Go and buy one to encourage him to keep this up!!