Got a RHS reverse lamp failed warning. Took the rear cluster out of the holder - you know, the one with the clear plastic for the reverse lights (spot the deliberate error yet?)
Got SWMBO to sit in the drivers seat and engage reverse - hmmmm no lights at all.. how odd. Got her to take it out of reverse and put it back in - nope, no reverse lights. Went inside and had a cup of tea to think.
Get the manual for bulb changing out, is it a fuse? Hmmm. Closed the tailgate baffled and was about to have a long think.
Then I turned round again. What a pillock - the reverse lights are on the lower tailgate and that's why they weren't lighting up on the rear brake light cluster. The clear plastic for the indicator threw me a curved ball. Swapped out the correct reverse bulb and I'm still laughing at my mistake hahahaha