In the end i am happy with the result, although in a perfect world it would ahve all been done under warranty. My grievance was the fact that they advised me to replace the remaining coils only when i was footing the bill and after i ahve another problem. If, when the car was originaly in the dealers, they advised me to replace the remaing 3 units with a 50% donation then i would have been very happy, but "se la vie"
Thanks for the help / info & links guys. A perfect example of how the internet helps all

Ben