I take it back! The layout downstairs needs work doesn't it? (Sitting room and dining room lovely, though - beautiful light rooms, though I suppose they're north facing?) I can see it's still effectively split into servants quarters and family house, ins't it?
You can only get from the kitchen to the sitting room via the dining room? Dining room = corridor, but also only place to sit and eat?
You arrive home, dump bags in hall, walk through dining room, go into kitchen...
You're upstairs, going to bed, realise you want a glass of water, go downstairs, through dining room, into kitchen and back again..
Presumably you'd be planning to knock the kitchen into the current snug, internal hall and utility room, and then use the space you've freed up to knock a door from the kitchen into the entrance hall? I can see that would work well, but I guess it would be a lot of hassle.
Also, I'm not great on room sizes, but aren't those 3 very poky bedrooms and two big ones upstairs? Which daughter gets the poky bedroom?