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aye - i did some research and as you say, it can be "ok", it can be "oh f***" or it can be a simple fix but then the noise comes back 20K later - so you pays your money (but i didnt!) :D
anthonyj-
The high pressure fuel injectors can be very loud on those, easy way to check if it is them is to blip the throttle to approx 4500 rpm whilst listening under the bonnet, on overrun the injectors should shut off and cut back in around 1800 rpm so you can rule them out against any mechanical problems.
Fixedwheelnut
Shame, could be a few things though - including just being a noisy engine, apparently!