Apologies - photos didn't go up first time round for some reason. Should now be there

That's a stunning space! Is it the top of an old church?

So you don't like the current configuration? (understand you don't get to keep the furniture)

Wow!! Love the space. You just need to cozy up your seating area with a rug, maybe 8x10 centered in front of the fireplace. Pull the seating away from the walls so it is floating in the room and place the front 1/3rd of the sofa and chairs on the rug to anchor them. Also try to line up the coffee table with the fireplace to create a more attractive sight line.

Oh Nick & Sarah! What a spectacular architecture!

Try moving the grey couch facing the TV. It will provide intimacy and functionality. We tend to place furniture against walls and that makes for awkward spaces in large rooms. I would keep the arches visually available as much as possible.

Move the two white chairs to the window side, right of the grey couch, with the small table aligned with the window. Keep them close to the couch to create a conversation area.

Barcelona chairs would look great in your space. You could also get a matching sitting bench to place across.

Barcelona Chairs

I like the frames on the floor :)

An area rug will anchor the living room.

Regarding lighting, those are beautiful chandeliers. I think scale and hight are important in such a large room.

You may be able to find something you like and get it painted white. Once painted, it will blend in with the environment.

Good luck!

Thanks for the comments guys.

The sofa and the chairs in the picture aren't ours unfortunately, so need to go out and buy everything for that room (apart from the fireplace).

We browsed around a bit last night and thinking one vintage brown leather and one dark fabric sofa - think that would work with the white floors? Anyone seen examples of that done well?

Also, any advice on coffee tables for the space? Do you think a standard wooden one would look out of place?

I love how open your house is! With your neutral colored walls I would try hanging up some art pieces with bright colors. This link has many great options! http://www.zazzle.com/krafty_kreations