Sad to say, I don't like his Sherlock hair much. Silly little curls and bouffy shape. The overall effect, in combination with the patented Sherlock Stony Face and Gruff Delivery, is a little bit Jeremy Clarkson.
Not that it puts me off, in the final analysis, obviously. 
devonshireduckling, if you're on Twitter you could Tweet the director, Paul McGuigan. I've seen him answer set-dressing-related questions on there before.
Leonie, thanks for that Last Enemy clip! Jesus. Forceful, huh? [mops self up off floor emoticon]