Right finally done this so thought I'd do a write up.
Sorry, didn't take any pics during the job, was in my lunch break at work but it's pretty straight forward.
1. Lift open the cap at the base of the wiper and undo nut so it sits flush with the end of the bolt that the wiper blade is attached too.
2. Slot a chunk of wood between the wiper-blade and the car and gently hammer the nut until the wiper comes loose. Undo the nut and pull off the wiper.
3. Open the boot and locate a torque screw inside the handle on the plastic boot/door card thing. Undo screw.
4. Grip the handle, place one hand on the edge of the boot and pull. The plastic boot/door car thing will come away. It requires a bit of force but not too much, else you'll give yourself a black eye.
This will reveal the wiper motor which for some reason is attached to the boot by three massive rivets. I'd never seen rivets this big therefore didn't know what they were, so had to pose the question on here :lol:
5. I used a 5mm drill bit for this part. Drill into the rivet until you need to push hard for it to go any further, stop pushing unless you want to go through the other side of the boot.
Keep the drill spining and rotate it as though you are stirring porridge this will eventually bring the head off the rivet. Do this for each rivet and pull the motor off the door and disconnect the power lead from it. Zip tie the power lead so it doesn't rattle.
I made use of the plastic boot/door card thing here and set it on the bumper to catch all the iron filings that fall from the rivets.
6. This will leave a nasty hole in the door so bung it up with one off these:
https://www.ebay.co.uk/itm/6mm-1-4-Black-Rubber-Blanking-Grommet-Grommets-Hole-Plug-Bung-Electrical-x-5-/220859552347?pt=UK_Cars_Parts_Vehicles_Other_Vehicle_Parts_Accessories_ET&hash=item336c41525b
7. Now clip the plastic boot/door card thing back on. Be sure to hook it over the two hooks nearest the rear window. Press it back in firmly and you'll hear the clips 'click' back into place. There are clips either side of the middle of the boot that require a bit more pressing to get them to 'click' back in.
8. Shut the boot, stand back and admire your car's tidy ass.