@kwick
Actually, my bathroom isn't very big at all. All the houses here are the same, and I looked at three before I bought. Two had the sink right opposite the door, with the loo to the left, on the outside wall, and the bath with shower over to the right. The sinks were all tiny and under the window, so no mirror.
This family had totally restyled it, with the sink being the thing they wanted to accommodate - so the sink is on the left as you walk in, giving room for a bigger sink and a mirror, over which is a big mirror with a demister built in (it's like being in a hotel), and then to the right of that is the loo - so the loo cistern is actually behind the wall, with access in the second bedroom built-in wardrobe! It does mean you can't open the door if the sink drawer is open but as I live on my own this is not a problem.
Bath/shower in same place, P-shaped but not a full length bath.
Imagination....