North facing rooms look lovely with soft grey on the walls such as Chic Shadow by Dulux with white woodwork. If you are changing your sofa I would go with a darker grey thick textured material such as Boucle weave as this will also give a feeling of warmth and cosiness. Add a splash of colour by use of cushions in toned down pinks of various shades, (or any other warm feel colour you like, mixing it up with different shades and variants), mixing these with some neutral coloured cushions and a throw. Incorporate a little copper in places for some simple but warming elegance, but only use this sparingly, perhaps for the ceiling pendant and or a floor lamp. For the furniture I would recommend some solid pine (rustic) pieces such as the Kendall range in Next they will compliment the colours whilst the colours will pull the grains from the wood. Throw in a nice woolly, decently sized plain neutral coloured rug for some texture and a cosy feel, that should look gorgeous in front of that beautiful stove you have. Finally, if the budget allows, some white shutters on the lower half of your windows leaving the top windows beauty on show would look stunning and give you the flexibility to open it up fully and allow the light in and to also close out the world for peaceful days whilst leaving the windows above free to capture the sky and bounce light into the room. I hope this has given you some inspiration. Be lovely to see pics when you are done. Happy decorating.

Ha ha yes looks much better that way round. I was going to have wider slats with more space in between but yours actually looks really nice. Cheers

Grey goes with so many colours so it depends very much on what you are drawn to as well. The rule of thumb being match cool greys with other cooler colours such as blue, pale greens and cool white. And match darker grey tones with warm tones such as burnt orange, mustard, and teal. But you can go soft pinks as well which give a lovely warm vibe too and work with sage green accessories. Hope this helps!

You definitely haven't got the whole lot wrong. I think it looks a very smart room. I like the shape and colour of your sofas and think they look great with the curtain/cushion fabric. Likewise I think the rug is a really good colour. I wouldn't change colour but if I you really pushed me I'd say get a bigger size (poss more about me than you! I've always kicked myself for not going larger with rug in my living room). Again if I was splitting hairs I'd say the colour of the units (TV, side tables etc) is not quite right. It's a bit too warm beigey for the other colours in there. So I'd maybe consider painting those either darker, cool undertone colour or maybe even the cream/white shade you've got on radiator wall/alcoves.