Solved, it wasn't the IRD cooler leaking actually the pipe to it, I previously had a garage change the clutch and dual mass and noticed it was stiff going into gear after this was because I was smashing the rubber pipe from the IRD cooler this caused a hole and huge groove in the pipe.
Unfortunately being a bank holiday weekend I couldn't replace the hose so to have use of the vehicle as a temporary fix I removed the damaged hose and put the feed pipe to where the return went essentially bypassing the cooler.