Or there is a grey colour called Heifer but I cant remember what paint brand...
Our house is mostly Dulux Heifer, and it looks almost white but because we have a Surfmist garage you can tell there is a difference. So get a Heifer sample and Shale Grey and go with the darkest of those two. I also have a section at the front painted Dulux Stepney, it's a really pretty grey, darker than these two but nowhere near as dark as your roof and bricks...now I've confused you
I checked my pms to see if you said it in your message...
I really wish we went with Heifer for our externals instead of surfmist, it seems to be throwing a slight green tinge on the externals. Do you find that on yours? If I ever get sick enough of it i am going heifer!
I think Shale grey 200% would look good... but get a sample pot of it to make sure...