Thanks for the responses.
I decided to remove the door card at the outset as I had several issues to resolve.
1. Door mirror loose
2. Window wind noise
3. Window squeaking on open/close
4. Leather armrest loose
1. I removed the mirror from the door. I unscrewed two screws retaining the plastic lid and the one screw retaining the cable. The three screws below the lid were tight. I removed these three screws to dismantle the mirror casing from the die cast aluminium bracket. The adjoining spigot faces were oxidised, contained crud, and were uneven. I filed the faces flat to remove the high spots, gave everything a good clean and reassembled the casing back to the bracket making sure the spigot faces mated correctly before tightening the three screws fully. The mirror folds like new... not a hint of looseness or wobble.
2. I adjusted the window to fix wind noise issue
3. The window squeaked and squealed when opening and closing. Initially I thought it was the rubber window seal against glass, but it is not. It is the window mechanism (window regulator sliding in the guides) inside the door, dry metal on metal. I gave the whole mechanism a liberal spray of Ambersil AMS4 Silicone Grease
. Opened and closed the window a few times... squeaking gone and operates smoothly.
I highly recommend this silicone grease spray. As well as lubricating moving parts, especially in awkward to reach places, it can also be used to clean and rejuvenate rubber components prolonging their life. Ideal for the window and door seals, and all the rubber hoses in the engine compartment making them look like new again. Spray on to a cloth and wipe the rubber.
4. The leather armrest was loose on the door card. The three tabs on the inside of the door card holding it in place were not bent over fully. I bent the tabs further... armrest is now secure.
It's been a satisfying day today... another four niggles sorted.
Two more niggles for the drivers door left. I still need to source a Door Check Strap and the small (approx 3 inch) door seal that sits above the door lock on the B pillar.