Now the right side brake light bulb has failed ...
It's freezing outside and feels like -18° C, so I've got to do this quickly ☺
Open the boot (called a trunk in North America) and pry open the portion shown below adjacent to the light
Use a flat blade screwdriver gently loosen, and remove the screw with your fingers
On the left side is the screw we just removed, in the centre is a new bulb, and on the right is a flat blade screwdriver which is the only tool required
Gently remove the rear light assembly by sliding it out of the two slots (do it with both hands if you don't have to take photographs like I'm doing here) ☺
The white and the dark grey portions shown below need to be separated to access the bulb(s)
Gently lift and slide the tabs on either side to separate
By now my fingers are beginning to freeze .... but I'd never wear gloves to do this ☺
Slide and separate the grey part from the white to reveal the bulbs
Get someone to turn on the ignition and check the brake lights if you want to make sure you're replacing the right bulb
Twist, remove and replace the bulb (the top right one shown below)
Check the bulb before fixing everything back
Remember to gently slide the assembly back into these two circular slots shown below