Thanks for input,the light tunnels I don't think will work as there is a bedroom above it. It's a semi.
Think the soil pipe must do, architect is pretty good, will ask her.
That WC door will then mean guests go though hall, kitchen and utility just to go to toilet. Even if they do come through garage, there will be sink in utility if they are super grubby.
I would ideally love an island and dining room table - I will hopefully have a window seat instead of sofa. I'm not keen on sofas in kitchens.