The Sketch Show had 16 episodes between 2001 and 2004 and the stars were:

• Lee Mack
• Tim Vine
• Jim Tavaré
• Karen Taylor
• Ronni Ancona
• Kitty Flanagan

See the BCG site.

Jimmy supplied “additional material” to 3 episodes and both IMDB and Comedy.co.uk are a little vague on all of the details (it was a long time ago). Thankfully someone has uploaded the videos to YouTube and so I’ve been able to view the names of the people that contributed (from the end credits).

• S2 Episode 4 / broadcast 26-7-2003 – see Video
• S2 Episode 7 / broadcast 2004 – see Video
• S2 episode 8 / broadcast 2004 – see Video

With episodes 7/8 – it’s likely that that one episode was shown on 17th April 2004 and one the 24th.

Jimmy was also the warm-up comic on this show’s S1 (and other shows) see here.