Sorry to not get back before now, decorating myself! OK, so there is definitely a lady there and definitely doesn't want grey walls. With the added information that the curtains are claret with gold streaks, I would say - go for the gold then. Also if you have some pine furniture, this makes total sense. If you look at the photo I included (and sure you can google for others) the floor is golden and wall grey, so just reverse things, wall gold tone and carpet grey. You can get some test pots and try out against the curtains to see if picks up at slight gold, but still goes with the claret and grey. Only trying these out will tell you how light or dark or bright or muted gold to go. I would advise putting two coats on a large piece of paper at least A3 and then taping that to wall, this is better as done on white so shows the true colour tone, plus and you can move it around and even better, not have to paint it out afterwards! Try looking at these samples in different lights at different times of day, with lamps on only, overhead lights only etc. I think you have the basis for a really good scheme. I would agree with adding texture in cushions etc (at later stage) make you can take them back to store and keep tags on until you're absolutely sure, you really need to try stuff in situ to make sure it works in your setting. About white - looks fine in brightly lit spaces in full lighting, like well lit bathrooms and kitchens, not so good in pokey corners or rooms with any shadows at all. Can be very hard and cold, even clinical in many Northern European rooms, especially in winter!

Thank you for taking the time to comment. I do appreciate it. We have lots of wood elsewhere in the house and whilst decoratively it would be a good choice I was looking for a warmer softer 'feel' than wood. I agree the samples are not very neutral but all the neutral carpets we've tried just fade to a dirty beige in the room, I think grey would deaden the look.

You are quite right, it is the tone that needs to be similar, for example in the bedroom pic above the carpet is a lot lighter than the wall behind the bed, but much the same as the side walls. It works because they are just a similar colour, but lighter and darker. The herringbone stair carpet is darker, yes a similar tone. It just works. Hope that makes sense! I have Egyptian Cotton in my bedroom and hall, stairs and landing. I chose quite a colourful carpet on the stairs because I love colour, but that herringbone one is lovely!

Thanks for the replies. @Ellie I think my partner got the idea of a horizontal one from a one pitch roof photo on here. they do look really nice. @oneplan that's a really good point re lining up windows if they are horizontal. Although I think long horizontal ones is the builders last choice as he says they'll take longer to install. We're paying a day rate so trying to get everything pinned down in advance and as slick as possible. Our internal layout is slightly different to the floor plan I added to the comments. The kitchen is going in the centre in the 'old' extension (front of the house is Victorian and existing extension is 1990s). The new extension will have the sitting area on the left and the dining area on the right (so the opposite of the floor plan). This is because the wood burner will need to go on the left side and we want the seating area around that. Do you have any thoughts on narrow vehicle windows one on either side for the gable roof? I'll try to find the photo of what I mean. Thanks