Hi I notice your blind and lamp are Laura Ashley Pelham. Laura Ashley does a duck egg white, pale duck egg and duck egg paint colours. Maybe you could have the duck egg white as the predominant colour and use in both rooms but also use the pale duck egg or duck egg in the lounge, or add some wallpaper. Not sure grey walls would work with the kitchen units. Perhaps more of a taupe/warm grey would work in both spaces though.

I hadn't spotted it was mahogany tbh when I first looked! I probably wouldn't go for a light wood with the mahogany, perhaps something medium in tone rather than mahogany just to balance out with the rest of the room? You could of course go for a different material for the console and add wood for accessories. For the bookcases I might actually paint them in the ŵall colour or the White otherwise they might overpower that area and the fire? Another option is to paint the actual fire surround. If you decided on blue for an accent colour for example you could paint it an Inky blue. It's quite hard to say without knowing what/if you'll bring colour to the rest of the room as you could end up with a living area dark in tone and everything else very light. The bookcases will also visually widen the living space so you may find you also need side tables for the sofa to balance it (or a chair angled in front of the bookcase if it fits) but perhaps see how it looks first before making any decisions! Art or mirror over the fire would work but I think art for colour/pattern.

Loads of options as you basically have a black canvas. I love a rich teal, or dark turquoise. You could also consider wine or pink, or indeed red, but careful of tones

We have purchased this house & knocked a few walls & added extension at the back,we are trying to find the best layout for the kitchen dining living area on the left,the sun rises at the front & sets at the back & there is some nice views to the back,any suggestions or advice greatly appreciated?