There does seem to be a huge range of opinion on what needs to be diverted around when it comes to CB's and towering CU. A lot of the time when flying around the London TMA in and out of Heathrow you hear pilots asking for steers around really pretty tame looking weather. If it looks like we will only get a little bump then I would rather fly through than load up an already busy ATCO. It is simply not realistic to avoid everything, turbulence is just part of flying and it is not possible to always provide a "magic carpet" ride for the pax. . .. .As far as DIY weather avoidance goes, it seems to me that even a fairly large CB is going to make much less of a bump than smacking a 747 over the centre of London!. Unless I felt that the aircraft was in REAL danger, and lets be honest, that is very very rare, I'll take my chances with the weather and maintain separation.