Rubber Membrane in Ice Dispenser disloged

I have a beko ap930 double door fridge-freezer. My Ice dispenser has stopped operating. The the ice box inside the freezer is all fine. Its the rubber membrane within the dispenser (in the door) that looks like its detached from its housing/fittings. I am struggling to get at the whole mechanism in the door. There doesn't seem any obvious place to remove the whole unit to get at the parts inside the door.
Many Thanks in Advance.