I was actually just about to reply to this thread with an update...
I got the car back yesterday after 2 1/2 weeks away with the company I bought it from, getting the turbo replaced under warranty as that was what Volvo diagnosed as the likely cause of the noise.
It's STILL making a noise on boost, so I'm now thinking that it could well be the EGR valve, since the Volvo dealer I went to also said that there was a fault code logged for the EGR valve.
I'm going to check out the air filter for gaps/leaks and replace my panel filter with a standard Volvo/OEM one to see if it makes any difference to the noise.
I've now got an aftermarket warranty on the car, so if it IS the EGR valve, hopefully they will cover the cost of that work which Volvo said would be just over £500 which includes their 50% goodwill payment towards it.
The technician did say though, that if the EGR valve was faulty, then it could be identified by a lurching sensation.
I've read around a few forumd and Renault (whose engine it is) have issued a cleaning tool to their technicians to de-coke the EGR valve if they're not too bad so I think I'll go to my local Renault specialist/dealer and see if they can help out first off.
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