Caution is a good thing where Cb's are concerned.
If you can see them, can fly around them, with plenty of room to get between them then that is ok. If you are IMC and can top them and / or have weather radar, that too is ok. Trying to fly in IMC with embeded Cb's around in Europe is Russian Roulet. In the USA ATC can give pretty good avoidance but over here it is non existant.
I think these are available to all, from AOPA ASF in the USA about thunderstorms and it gives some pretty good advice, although most is aimed at flying in the USA. Well worth a read....
http://www.aopa.org/asf/publications...WT.cg_n=aa_asf
http://www.aopa.org/asf/tstormCard.p...WT.cg_n=aa_asf