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Ok so a small update - im convinced its the EGR Cooler as when cold the headder tank bubbles like crazy but once warm and the EGR closes and the bubbles significantly reduce.

Also, the heating matrix is only blowing cold air at the moment and as the cooler is inline to this matrix i think its presurising the system and creating a blockage.

Im going to investigate tomorrow and strip down the EGR and see if I can find a fault with it - fingers crossed that this is the issue.

Im also going to chgeck the gearbox oil to see if there is water in there from the radiator.