Oldjets
Mike (Metalmickey) lead me in the right direction... you got to work from the back if you want to make life easier.
FIG 1.
Screw 1 - Open Cupboard door and above the hanging railing there is a screw that goes into the overheard cupboard.
Screw 2 and 3. Tricky buggers to find if your like me and not used to removing camper interiors. Lift lid and remove trays (if yours has trays) Fixed to each side of the cupboard are runners for the tray to sit on, remove runner on van panel side and you will see 2 screws holding cupboard to van panel.
Screw 4 and 5. Back inside the wardrobe unit and there are a couple of screws fixing wardrobe to long unit.
Screw 6. Inside wardrobe at back (tailgate end) and on the base there is a bracket fixed to the floor.
Once you have moved these the majority of the pain in the a*** hidden screws are done.
I'll post another pic shortly of the other units and screws.
Before other units I removed fridge. Certainly seemed easier working without fridge in place.
Screw 1,2,3 and 4. These are in the adjacent cupboards (or atleast on mine they were) near the front.
Screws 5. Two screws either end of panel, undo both and pull control knobs off (This makes it easier to disconnect wires).
Once the fridge is out you need to disconnect any sink pipes, heater pipes etc ( i found it easier to disconnect the gas pipes to the heater than unscrew the heater and try and move that along with cupboards).
The other screws that hold the units in place are in the cupboard behind the drivers seat.. a small L shape bracket screwed into panel covering. Possibly another L type bracket at the front corner of that cupboard going into floor.
Something to bare in mind when you think you have all the screws out but still nothings really moving much is that it may not have been moved for 20 years so a little levering here and there should get it moving.