Secondly... and most amazingly... check this out!
Those three little letters? That "Wow!" at the end? That's from the man himself, Arwel Wyn Jones, who created the brilliant BBC Sherlock set! Needless to say I just about fainted dead away ...
... then, being me, I thought "Oh crap. What if he means 'Wow! what a nutter?"
... then I pushed that thought aside and decided to believe it was a nice 'Wow!' afterall :)
Good luck folks!