An update on this, my 2 week old GTI went in to my local dealer yesterday regarding my dash rattle.
A technician drove it with me and acknowledged the rattle from driver's side.
Dealer called me today to say they can't trace it after "having had everything apart".
Oh dear, I told them I don't want it back until it's sorted.
Really disappointed in this, it was so bad last weekend it put me off driving the car.