It was 1989 when Robert Llewellyn first had his head encased in the one-piece latex foam-rubber balaclava that is the head of Kryten in Red Dwarf series three, and it gave him a distinctly funny turn.Gazing at his own reflection and seeing the face of a mechanoid robot staring back was surprisingly scary, not to mention uncomfortable and rather sweaty. And he couldn't even eat his lunch.Since then...