Took the opportunity to apply Dynamat Xtreme© to the boot and cabin.
Again I have read mixed comments about the merits of this in the forums as its not exactly going to be a quiet ride! but there is a some logic to suppressing any flex and hollow sounds within the body.
Dynamat Xtreme© is apparently the highest efficiency sound damping material available and the most effective product for stopping noise and vibration in your vehicle, consisting of a butyl backing and aluminium face sheet, it is easy to cut and very malleable to curves etc.
It was purchased from Car Builder Solutions and is applied to the boot, a heat reflective variant is installed on the bonnet.