There should be a little bracket on the inside of the door that stops it going up too far, part no YKC3620 & YKC3621, called a stop bracket. You can adjust it to set maximum height.
Hi all Adjustment worked brilliant many thanks one other question the top quarter light rubber on Rimmer bros diagram it says there is a self tapping screw holding it in but on mine there's nothing its just pushed in and there is no hole in the quarter light for a screw but there is a hole in the rubber. Many thanks