Now I know why I joined the forum

So....

(1) GraemeS - Spray some water onto the belt to see if the noise stops.
(2) Fox889 - Apply some baby powder onto the belt to see if the noise stops.

If it stops then the belt is very likely the culprit.

I am currently with my mechanic who is bent on convincing me that there is nothing wrong with my turbo.
- this involves him driving the car in ways I never knew you could and me reaching for the Eprosartan mesylate

So I sit glued to the passenger's seat and await his verdict.....

All hoses are fine.
DPF is fine
EGR is fine

He thinks my problems are because of an oil leak I had last year which resulted in me changing the Oil cooler

We are going on another spin (to try and invoke Limp mode)
I will keep us posted.... 2012 Vogue 4.4 TDV8 Santorini Black - Current
Sorry! there's no going back once you've driven a V8