Well after plenty of lying under the car I am stumped.
Took out the shocks and cleaned them up. Checked the mountings and rubbers and everything a okay!
Inspected the exhaust / drive shaft (basically anything that can move) and all seem to be okay.
Can't think of anything else so I will have to take it down to my mechanic and put it up on the hoist for a comprehensive look.
We'll get there