Thanks so much for all the comments. I would like to keep B's kitchen/utility design, but think we will have to get rid of windowless, second reception as it could put buyers off.
Such a shame as we would love two reception rooms, plus kitchen/diner. Thing is though even if we do go for B, that corner of the kitchen (where second reception is planned for) will still be dark. I suppose it's better to have a dark corner in a large kitchen/diner that is full of light elsewhere, compared to a windowless room.
Converting the garage is not an option. We need the storage and I don't want to take rubbish through house to bins that are permanently out the front.
I can't get my head around having the utility where the second reception is. It doesn't seem to flow right with a front adults room backing onto the utility. Besides, we need the door from the utility into the garage for access. The utility room will probably be my favourite part of the house!
Arrgh. Want to get this design right...