If someone can please simply clarify this point....
If you wish to get proper use of your Apple use, you will need to still carry your phone around with you as you move from room to room, to keep the Watch operating fully?
No. Apple has stated that you can leave your phone in one room while you move about the house and the watch will continue to work. How far you can get away from your phone will depend on a number of things including how many floors/walls are between you and the iPhone. So we'll all be madly testing this next month.