Just heard from the Service Manager.Thanks for the update.
It will be interesting to see if other people will report this issue or whether it will be an isolated exception.
They have replaced the shock absorbers and taken the car out for a test drive, but the knocking noise is still there !!
Their Master Tech is on the case and they will report back to me tomorrow.
Their problem is that as it's a new model, they have no reference point or history on the type of vehicle as this will be the first instance of the issue they have come across.