Goes up and down off the switch pack but only goes down on the door switch, won't go back up. All other doors OK. Likely to be the door switch itself? Are they similar to the switch pack switches in that they can be stripped down and the contacts cleaned, successfully fixed my sunroof switch doing that using martys guide off here.

Simpler than the switchpack switches. You'll find that taking it out and squirting contact cleaner into it could be all it needs.

Nice.
A job for when the rain stops!
Presume it's door card off to get it out?

No, just the interior handle surround out, the switch just pulls out once that is off.

Thankyou!

Contact cleaner hasn't worked but swopping over switches has confirmed it is the switch and not the wiring etc.
Looks like a similar arrangement to the switch pack switches involving a bit of welding with plastic to reinstall the dismantled and cleaned contacts. Done that before successfully on my sunroof switch so not expecting too much drama.

Switch taken apart, cleaned and reassembled using a Defender door card plastic stud as the filler rod. Working again.