anno We wanted a walk-in shower because climbing in and out of the bath to shower was a pest, and then sitting up in the bath and pulling yourself to stand up became even worse. We wanted the biggest shower we could, but to keep a bath.
Our bathroom is quite big (9 x 7) but with a door at one end and a window at the other there was a limit on where we could place things. the recatangular showers were still too deep to go at the side of the door - the only logical place if we kept a bath.
Then we saw a bath in B & Q which was shaped like a letter P. The narrow foot of it goes beside the door and the semicircle is far enough away for the door to open (had to turn main door round but that was nothing) Then we found a bath (also B & Q) which tapered at one end, so there was more space between it and the bulge of the shower. Result - bath, shower, loo, basin and a chest of drawers for towels (laundry in bottom drawer) and plenty of space in between.
Incidentally, neither of us ever used that bath after the shower was installed. The grandchildren are hosed down in it though.