Cheers all, I'm loving the banter on here so far. Seems a bit more civilised and informed the PH!

*ducks*
I'm off to look at a few this weekend, I'm based in London so the nearby ones are in Abingdon or Potters Bar. I've not driven one for a few years and the last E46 M3 I drove was quite tired and I still loved it so hoping to be impressed again.
Thanks for all the offers of information, two questions for starters:
What's the highest milage anyone knows of for a CSL?
How important is it to have a warranty in people's opinion/experience? If I bought one without what might go wrong that would cost big money? Are the engines as bomb proof as they seem?
Thanks again,
Jon