Thanks for the responses folks very helpful!
I think this is good idea and something we will incorporate for additional light.
Yes that is playing on my mind but I don't fancy having a laundry room upstairs!
I'm not sure of the technical term but we are going to put a wall with in-built stove between the dining room and snug but with the ability to walk both sides of it. I'm hoping this will block out some of the noise from the kitchen but point taken that conversations will travel. I don't want to put the dining out to the left as that would hinder the views I think. by having the long open planned section on that side of the house we wanted to ensure all the rooms were parallel to get the same views. I hope that makes sense!
I also want to have the west facing window in the snug / living area to be a large frameless window but need to weigh up the pros and cons of this.
Thanks Ferdinand as always, very thorough! I've made comments in red
A few other changes that i'm considering
1) I want the utility room to be bigger / longer but need to think how this impacts the rest of the house
2) The door from the hall into the living area annoys me, I want that as a contained space and not a walk through area from the back door!
3) Moving the door into the kitchen further back so that the entrance is into the dining room rather than directly into the kitchen. This would mean moving the stairs forward closer to the door.
Thanks again for such valuable feedback!