if you are looking for a crisp, clean grey, I would stay away from Farrow and Ball, their light greys all tend to have a muddy look, which is fab if you want vintage look. If you are looking for high end paint, little greene colours are definitely more clean and crisp than F&B but a lower price alternative would be Laura Ashley, I used their pale dove grey and it was very fresh and clean (really pale though, not sure if that is what you are looking for). You will probably read some bad things about LA paint but my experience of it was fine, looked like any other paint when it was done! Also, don't pay full price for it, it is always on sale.

I know it's counter-intuitive, but I'd go deep saturated Blue/green...or Teal. All over. It will unify all the odd planes and angles in this room. Keep all the woodwork a fresh white. Use pops of jewel toned soft furnishings...to link the blue & taupe sofas...or... Use patterns in tribal/ ikat tones to keep it masculine. Build up some open shelving for storage along dead-wallspace near the door entrance to this room.

F&B Skimming Stone?

Have a look at F&B All White. It looks fresh but has a softness to it. You could have a dark feature but I’m not convinced it would be a good idea in a north facing room. Can I ask what colour your walls are at the moment? Here’s some pics of All White. There are other whites of course such as Pointing or Wimbourne White which are warmer. ALL WHITE WIMBOURNE WHITE