So yeh, I'm actually just a touch colourblind. Not by much, but by enough that I had to get Alexx to come over to clarify which shade of paint was the right one for the wall because I couldn't tell. I'd narrowed it down to 3/4 shades but couldn't get a definite answer myself.
Also, turns out the one shade I need is the one shade that they don't do tester pots of. Fun.
Also, turns out the one shade I need is the one shade that they don't do tester pots of. Fun.