Great to hear there are still some on here with 406's, sorry for the delayed response just been busy with work.
The Volvo was an impulsive buy, apparently id didn't need much for the next MOT, really though it was a lemon, used water and oil, produced grey, black and also white smokes at various times and had a knocking sound. I suppose the fact it arrived dry on oil was a sign of its issues. That is now sold.
Disappointed by the issues with the Volvo it has been replaced by something more reliable:
The 406 is going well at the moment, i plan to get the C5 through its mot (failed on an ABS light yesterday), tidy it up and drive it. While using it then attend to the niggling issues the 406 has. The 305 project will be able to start up again, it had taken a pause while i did final year.