Mid- grey for attic bedroom?

[WhenInDoubtSmileandPout]

Hi, I'm after recommendations for a mid grey colour for my teenage son's bedroom. I'm a little worried it'll look a bit "battleship grey" but he's set on that shade of grey. The room faces south and it's very sunny. If you can recommend a specific colour I'll be very grateful.

Farrow and ball
ammonite, dimps, purbeck Stone
F&b are really expensive but you can go to Johnstone’s paints and have the colour matched for so much cheaper

I'm thinking of going for F&B Plummet. Have any of you used it?

I painted my 15year olds room yesterday in Dulux Polished Pebble and it looks great, I would really recommend

In the end I've gone for F&B Plummett. I was worried it'd be a bit industrial, but it looks great. I'm very please with my choice!

Farrow & Ball for me every time , we have cornforth white which is a beautiful grey and strong white which is just as great, going to try ammonite next, haven’t used plummet glad it looks nice whenindoubt