Went off to TTS this AM ready to calm but firm and pleasently supprised to find they had no issue looking at the car and traced the issue to to the pipe that runs from Turbo to Charge was loose on the turbo side and had moved up ever so slightly which was causing the lovely noise when coming on boost.
Was slightly worried though as I have not touched the Turbo side of this pipe since the work was done so must have been loose for past 3 months......!!!!
Well its nice when something that seems serious is actually some quite simple although I was a bit embarressed I didn't pick up on it..........
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Still its sorted now and all FOC!