Well, after much diagnosing and messing around it looks like my turbo is gunked up.

Does anyone have an idea how much I`m looking at to refurb/replace the turbo on a 2002 EU3 S60 D5?

No errors on dash or relevant codes stored on the car, just intermittent restricted performance under load.
Oddly, no apparent smoke or noise from the turbo etc.
Nothing else obvious that could cause this, as far as I`m aware, without throwing error codes in the ECU or a warning on the dash.
Dice/Vida at a friends shows nothing at all that could account for the problem.
Been perfect for over 3 weeks now, then started to "hold back" when accelerating up a steep hill last night, kept my foot in it and it seemed to "cough" and clear itself. Been driving fine ever since.

I suspect I`m looking at £600 plus for a recon turbo but I`d like to hear your experiences.

Cheers.