Nice try, Azrael 5, but you're photograph is of the Grismer lock, and the site states, "Long unobtainable, this superb new model is made by Mick Hanzlik, the Master Locksmith."
Oh really? Enlarging the photograph clearly shows the maker's name "ABUS" on the lock. A Google search suggests the Abus and Yale locks are indeed very similar in appearance (and doesn't turn up any other lock of the same type). The real locks both seem to be currently available.
Unlike other locks by Mick Hanzlik, nothing else is stated about the principle of this lock. It possibly is just a real lock, but used in the way I have in mind for the Yale lock, which doesn't require the magician to handle the lock either. It's entirely possible that these two real locks are of almost identical internal design, so that my method works with either of them.
While Googling for the above, I found a supplier of a "needle through arm" illusion, which seemed exactly suitable for what Derren did with Robbie Williams, so I wouldn't argue that Derren doesn't sometimes use props that can easily be bought from a magic shop. I'm just saying he really didn't need to for his lock effect. Unfortunately, the DB video doesn't show the lock clearly enough for the name on it to be read.