What I noticed on my third viewing was that Sir Andrews' speech was, to say the least, a little restrained, having to use prompt cards and almost visibly trying not to check his watch. As though he'd had the time restaints embedded into him!
I remember both 1999 and 2000 last nights where he gave very natural and lucid unaided speeches, and really enjoyed the banter between himself and the prommers, especially the 1999 one where he effectively gave two speeches (I think it was 1999, though it may have been 1998).