start under the main door handle the bottom of the trim prises off this shows 2 or 3 screws. Starting from the bottom of the door pull the trim away from the door. At the top of the door pull off the cover from the little speaker and unclip wires. Pull the surround from from the door opener this just splits and pulls away you should then be able to undo the screws and pull off the door trim. Oh i just though when you pull off the trim under the main door handle this exposes the underside of the window switches you can check for loose wires maybe save youself all the other hassle. Hope this helps.
Many thanks. For some reason after driving for about 5 mins (admittedly over a bumpy lane) the window worked! It is shut now and I won't be using it until I can get it checked. Must be a loose connection or something!