We knocked down the back wall to make it open plan with the kitchen. We kept the wall with the hall so you still have a hall. Leaving the hall means you can shut off upstairs which is good with the kids in bed.
Knocking down the back wall means we have a big dining table in the dining room and because it's easily accessible from the kitchen you use it every day.
The area by the patio windows at the back of the kitchen has a sofa and is essentially the kids play room.
This works well for us. Means none of the space is wasted. Makes the ground floor feel huge and dramatic and means there is light in the dining room.
Don't worry about the cornice. This can easily be replicated and you cannot tell in our house which cornice is original and which we replaced. They look identical and lots of companies locally do it.
If we sell, a future buyer can easily replace the wall with plasterboard, so it's not a big deal if somebody doesn't like the open plan effect. You do need a steel frame to stop the house falling down, so it does cost a bit though. Looks great in our house- I would totally recommend it.
This is not my house - but here's what it looks like in somebody else's:
http://www.rightmove.co.uk/property-for ... 76448.html
http://www.rightmove.co.uk/property-for ... 76448.html