Thank you for posting this highly interesting pic! I'm completely unable to imagine anyone but Derek Nimmo as Crowley, so this chap just doesn't do it for me (and I agree with everyone who says he's ever so reminiscent of Dr Who). Crowley, on the other hand, looks sufficiently up-his-own-arse to be a convincing minion of darkness, and as you say, there's a faint miasma of desperation about him that works very well within a theology where the dice are stacked against the devil. I'm not usually a Tennent fan but presumably this is a charachter where even he can't wallow excessively in emotion?