In a recent interview, where he went seriously off track, Shaun discussed the origin of Stewart the Meerkat, who became a regular on TAYG. (And yes, we had always spelt it Stuart… wishful thinking?)
The whole purpose of Stewart was a set-up for when Kat Stewart was going to be on the show – Shaun could introduce them to each other, and repetition would ensue. He actually did – on the March 22nd 2011 episode.