It was happening in all gears over 2nd between 1800rpm and 3500rpm. it was embarrassing.
I took my chances with the research I had found and decided that it was the turbo actuator rod ( please correct me on tech terms as I am usually incapable of changing my own wheel most of the time )
I emailed VW, I asked no questions, made no fuss or no complaints, I just simply requested a part! a 'Wastegate rattle clip' ... it arrived, I jacked the car up and I fitted myself!
IT WORKED!! PERFECTLY!! No more rattle at all!
I have read many threads on this subject and by the end of them there was no definitive answer as to if it even worked, I am writing this thread to say without doubt... the clip works! £ 13.42 + vat!