PAXboy,
I am not out to insult you or anyone but as someone who flys light aircraft more than most ie. 250 odd hours a year all over Europe, I am more worried about this type of thread sending the wrong message.
I just DON'T see a big problem, sure there are busy spots but not that busy, and usually for short periods.
The other thing that worries me is the amount of airline drivers that rant and rave about light aircraft being in "THEIR" sky and some will tell you about having to do steep turns to avoid us every time they fly, (what a load of tosh)
Most PPLs have more sense than you give them credit for and very few don't know know where they are and what they are doing.
I think some common sense and better situational awareness and understanding of each others position, from both private and comercial pilots, keeping ATC well informed would go a long way to resolve the situation in the London and other busy areas.
Tony