Hi everybody,
Just for a bit of positive feedback - and it may be useful to some other people.
Although Stachu100 on Amibay doesn't repair CS-PPCs, he does upgrade them... and of course if the problem is that your PPC doesn't work....
Anyway, long story short - Just over a week ago, I had in my hands a glorified Cyberstorm MkIII - actually a 200MHz PPC but the PPC was dead as a dodo. Today (and 250 Euros poorer, which isn't much all things considered) I now have installed a fully working CyberstormPPC running at just over 360MHz (he replaced the 200MHz part with a 350MHz one). And he installed a new fan too, as the fan was what caused the original's death.
250 Euros isn't much to get a CS-PPC back alive again, especially when it's now a bit of a speed demon (for a Classic Amiga anyway!).
If anyone else has a CS-PPC where the fan stopped or the PPC is dead it may be worth a try asking him - but of course be warned he's not really offering a repair service, just an upgrade - but you may be lucky like I was.