Heh. Listening to a Doctor Who 'Lost Story' (an audio version of an unmade TV story from Big Finish) called The First Sontarans - and AH is in it, with a rather dodgy 'yokel' accent - which he loses within the first five minutes!
I still recognised 'Milner' the instant he spoke, though...
Details here if anyone's interested:
http://bigfinish.com/releases/v/doctor- ... tarans-418