Back onto paint... Grey Steel 4 is too light and under the couple of lights I've shone at it it is also too purple. Either the formula is wrong or the colour was a bad choice. Going to change it to Grey Steel 3 for the walls, and this is probably going to have to be done after the cabinets are fitted and before the worktop goes in now.
Actually going to stick with Grey Steel 4.
So... it turns out that the builder's LED lights are all a very blue and bright LED... and as such, the grey looked lilac under the lighting due to the blue levels of the LEDs.
Under the Philips Hue lighting which isn't blue, the grey is what I wanted - a light grey that is neutral and takes on the light of the room.
Actually going to stick with Grey Steel 4.
So... it turns out that the builder's LED lights are all a very blue and bright LED... and as such, the grey looked lilac under the lighting due to the blue levels of the LEDs.
Under the Philips Hue lighting which isn't blue, the grey is what I wanted - a light grey that is neutral and takes on the light of the room.