I'm rapidly getting through the complete Jonathan Creek
boxset, courtesy of the bargain forums and Benson's World
and was just wondering if anyone knew why Caroline Quentin left after series three? There doesn't seem to be much information about the show on the net. The little I have found just indicates that, when she declined to appear in the 2001 Christmas special, there was still some possibility at the time that she might return for the subsequent series (which, ultimately, she didn't).
Having said that, I feel as though I may have written off the introduction of Julia Sawalha for the remaining episodes upon their original transmission, although arguably it wasn't helped by the BBC splitting the six part series into two shorter three-episode runs. I'm always suspicious when shows continue after losing one of their key elements, but I actually think the final series largely maintained the quality of previous instalments after re-watching it.