Wikipedia and a couple fan sites claim there was a bit of Whose Line produced for the 1995 Comic Relief. There are no videos posted anywhere, and nobody has a list of games played on it. imdb does not list Clive or any of the supposed performers as having performed in it. The British Comedy Guide seems to have a complete list of the evening's entertainment and it does not list Whose Line or Clive or any performers either.
I'm guessing Wikipedia's in error and there was no Whose Line involvement in Comic Relief 1995? So the only two (so far) are 1989 and 2011.
If anyone has any definitive information, or even a speculative rumor that I can try to track down, I'd appreciate it.