The weakest link is not the airspace infrastructure nor the ATS provider but rather the crews. There is a massive spectrum of training standards, abilities of crew members and quality of operational control from commercial operators from all over the world. To say that the London TMA is a multi-cultural environment is perhaps a slight understatement!
Then you have the corporate aviation industry which in some states has little in the way of any tangible oversight or regulation whatsoever.
With the THY B773 incident, I personally thought it was very telling that the commander was in fact a Line Training Captain and he used non standard TCAS R/T and did not follow the RA when he first heard it. Now if that is from an established flag carrier.... well need I say more?
The sad reality is that the difference between standards on the flight deck in the UK and Europe is in some cases a world away from what you can and indeed will see in some other states further afield. You can have a multitude of ATC procedures, initiatives and ideas, yet you still have to rely on the guy in the flight deck doing his job properly.