Managed to track down a New cause for a " Squeak / Groaning Noise ".
Started a few weeks ago with the change in weather, a squeaky groan behind the front passenger seat and seemed to be high up.
Only occurred when driving a " cold " vehicle, after being parked for at least an hour or so. Only occurred on side to side motion and not up and down, like speed humps.
So checked roof, up and down with some silicon spray on seal. No Change.
Emptied out kitchen cupboards - no change.
Checked inside for any loose bolts or fixings - none - no change.
Accidentally lent against front kitchen corner - SAME NOISE
Further investigation showed that pushing the kitchen unit, at the front end behind passenger seat, towards side window produced the noise. The corner next to the bottom 'B" pillar trim behind the passenger seat was the area. Trim firmly in place and no adjustment possible on kitchen unit. Some Silicon spray helped so squirted some Lithium grease behind the Lower/upper trim overlap and between lower trim and kitchen unit. Cleaned away excess and Noise now gone. Silence reigns once again.
I think it is temperature related and would disappear in warmer ambient temperatures or even colder temperatures.