OK thanks for all the advice, it's all stuff I wouldn't have thought of on my own so I really appreciate it, I feel much better about what I'm doing now, I have a bit of a plan in my mind coming together, found lots of good stuff on pinterest. Only thing is, I'm not sure I'll have the time to paint at the moment, if I leave the walls that neutral colour (it's Dulux Timeless) for now and just get cushions, throws, rugs, lamps, pictures, plants etc I'm hoping that would be fine? DH and I are both working full time, he's basically never here as his hours are so long, so as well as working a full day I'm doing all housework, food shopping, cooking, gardening as well as try and give the teens some attention. Plus shopping for this stuff may be more difficult than usual so it may all take a bit longer than it usually would. I think a warm light grey would work eventually though. I do love some of the more out there colour suggestions/combinations that people have mentioned to me, I'm just not comfy with the idea of a dark colour in such a long room with natural light only at one end.
Anyway, as a result of your advice my plan is:
rug: get a much bigger one, with some pattern, possibly some colour which could be picked out in any cushions. When I look at the photo, the rug does look a bit silly in the middle of the floor now I look at it. Funny what you just get used to, seeing it every day.
cushions: burn the spotty Athena 80s cushions! use lots of textures and contrasting patterns/colours
throws: texture, maybe use it over the back cushions of the sofas
2 standard lamps by each sofa: would a metallic style add some interest? And probably another couple of side table lamps for up the other end of the room.
Ceiling light: can't be any bigger or lower really as DH and DS would bang their head on it. You can't really tell from the photo but it's quite low, it's not Victorian height ceiling, so only a few inches above their heads as it is.
Bigger mirror above fireplace, or a very large bold print/canvas. Where are the best places to look for large prints/canvases?
Gallery wall above sofa/s.
Very large pot plants, and other greenery.
Wicker/natural material accessories.
Just need to find all this stuff now, and figure a way of getting hold of it during lockdown. I am still waiting for some deliveries of things that I ordered weeks and weeks ago and about to chase refunds so I'm a bit wary of online shopping at the moment.
Thank you all again, so much, I'm sure all this sort of thing comes naturally to you all, but it really doesn't to me, so I do appreciate it. I will probably be able to do it all in the school holidays and will post a photo then!