Ah but cloudpants what are you making it real in comparison with? Who's to say that not painting them wouldn't look far better? Before you say anything....I made no comment either way...and yes it does look really good!

No single chairs (yet). The blue lounges are 100cm deep by approx 198cm long. I did place them adjacent one another to see if I could have that configuration but the one against the external wall extended past the door opening and it just didn't look right. So I presumed a cnr sofa with the short side against the external wall or sofa with chaise would probably be the best option. It is possible that I could get a 2 seater but would have the challenge to make sure it complemented the three seater rather than clash. There appears to be more choices for rhf sofas than lhf.

Yes, it really is a strange dimension. I think I’d like something in black. I had a white ceramic stool there & it looked as if I had failed to match the white around it, if you get what I mean. I’m now trying to find a really good piece to put there. Options are all open. Thank you for your help so far.

You can get plants and pots in all different shapes and sizes and colours . Whats your favourite colour ? Everything seems off-white , but I'd even 'steal' the basic idea from Macyjeans pic -- get a nice piece of ply , cut to shape , do in a reddish stain and varnish if required -- it will make that corner warmer . Basically , have a wooden 'triangle' instead of a blink-and-you-miss-it ledge that blends with everything else ( and I mean everything ! ) . Then add say a red or maroon pot , with a taller plant , say a lancewood or similar , even a cactus ( maybe not if you have children ! ) . Another 'slight' possibility would be an artwork ( or two ) on the walls to lighten and brighten , but that may make the ledge look even stranger , although you could do say an art object or even 3 candles or vases on the ledge , in complementary colours to your art .