Thanks Helen. Actually I've read that Bristol paints have a record of the formulas used for Benjamin Moore's paints. Not sure if that's accurate though. Also thanks Tilly for all your suggestions. Ironically I used China White throughout an entire house many years ago and I loved it. I also used Whisper White for a lot of the painted shelving and some furniture. It was an open plan house and the colour scheme was seamless. Received lots of compliments. The woodwork in the rest of our current house is in Antique White USA (as are the walls), but I'm wanting to go for a more 'intimate' look in the sitting room, and I'm still drawn to the idea of a warm charcoal grey for the walls, and Antique white USA for the architraves, skirtings etc. I'm attaching a picture of the Benjamin Moore Rockport Gray, but I know it's impossible to choose a colour from a photo, but it will give you an idea of the colour scheme I'm wanting for that room. By the way I know what you mean by the picture rails limiting the use of walls. I'm attaching another photo I've found that shows a similar room (although a lot grander) without picture rails. But my partner is rather fond of the picture rails, and I can just imagine his response if I suggested they be removed! It's hard enough trying to decide on paint :)

Stillo haven't moved in yet....but we went with Dulux Natural White after all that...and boy am i glad i did :) It's such a nice white colour. I have a feature wall that has my TV and fireplace on it and i did that in Dulux Malay Grey which is like a dark grey colour...but rest of the house is all white

I work as a colourist and the easiest method for a upmarket look is to choose an exact colour to match one of the colours in the tile. I would take the tile to a paint shop and get the colourist it match exactly one of the greys in the tile. Make the depth of the colour a light version. All white walls are on the way out. Lappatto tiles usually have some texture as they are semi polished. This is the latest look in tiles as they give a shine without the maintenance of polished porcelain which had been in. They are usually less slippery than satin or polished tiles depending on the brand.

What natural light do you get in the room/what orientation? i.e. is it a 'cold' or 'warm' room? If it's a colder room, I'd go with a grey with orange/red undertones to warm it up a bit, or if it's a warm room you could get away with a cooler grey, maybe green undertones to compliment the maroon. Or you could even try a green rather than grey. The Aerobus is a blueish grey so will be cooler. As others have said you would probably want a lighter tone than this for the walls (unless you're purposely going for a dark dramatic mood). 'Miller Mood' is a couple of shades up in the Colour Atlas. Get sample pots and paint a section on each wall, or paint a white bit of card and stick to the wall to see how the light is at different times of day.