Might as well do an update.
Solved the problem as of 3 weeks ago.
Found the rear mount was leaking (front already replace), TCV was changed, Boost pressure sensor changed and a replacement turbo.
All vac tested and smoke tested again, no problems visible and no codes.
Car is now quieter, averaging 2 mpg more on my 10 mile commute.
So hopefully that is that.
Lesson learnt: On a car thats 13 years old, change the lot, dont mess around with bits here and there. You may save a few pennies in the short term but its all going to need changing at that age.
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