If you're comfortable with the colours, then stick to it. The last thing you want to do is create a living room that you don't feel at ease in. I agree that the colours seem a bit flat, so try just adding bolder shades of your current colour scheme. We'd stain the table a darker wood colour, such as walnut to add a striking feature and play around with the furnishings. You can instantly change the feel of a room with pillows and throws, and since you already have a beautiful array of them, trying changing them slightly by adding new colours with dye. Try upholsteries (or purchasing new) table lamps to something a bit more playful and exciting. Finally, that table centrepiece is screaming for a bright bunch of flowers, like tulips! We'd love to see what you choose.

Is the sofa navy? This one isn't too dissimilar but no idea on quality. Ive just seen you comment on another post, is it navy velvet you're after as that may be achievable on budget or do you want the same style as this one? i've also seen a few of the heals ones on eBay. One is 8 months old in what looks to be your colour plus new ones but in different colours. It may be worth looking on there from time to time to see what comes up http://www.furniturevillage.co.uk/Inventory/Upholstery/Ultra-Furniture-Twilight/2-Seater-Sofa-Bed.aspx

Have no knowledge of window film, sorry, but out of interest, what are your reasons for not going along with your husbands suggestions?

You have lots of space. I'd put the utility room in like in the third picture. And then the kitchen in like the second picture (so it backs onto utility). Then you can figure out where you'd put the dining table and seating area with the space that is left. Having lots of circulation space is going to give it a luxurious feel - nothing worse than everything crammed in together and no room to breathe. But if you can get everything in from just that small corner extension, then it would certainly be a lot cheaper and easier! If you need 1m to make it work, I think I'd just do the full 2m that you've for permission for - then it'll be really more than you need but you will appreciate it.