Anyway, most CAA still tolerate flying for aeroclubs with PPL... or I mean, they dont ask if you have CPL
They will start checking as soon as you have an accident (god forbid!). It's never a good idea to do something illegal just because everybody is looking the other way (or not looking at all), it can bite you in the ass sooner and harder (think insurance cover) than you think.
Ciao,
Dg800