mejeep has pointed out to me the sad news that Mark Ritts died, most famous for playing a lab rat in Beakman's World. I do remember catching a few episodes of that when I was young and have fond memories of the "guy in a rat suit". (Ironically, that is what I am best known for now myself.) Vale, Mark Ritts.
EDIT: The episode I best remember him from was when he was worried about the prospects of toilets exploding and was abstaining from relieving himself as a result, almost to the point where he would have had to worry about exploding himself. (I never understood why he didn't just use a tree.) It could be from him that I got my love of toilet humour.