To pick up on a point by Liz, many, many modern ladies loos, including a prizewinning set on the M4, have doors which open inwards, rotating through the only standing space. Judges by a man without going in.

Apart from the obvious problem for users, unless size - 1, this means that cleaners cannot access the whole cubicle, and that if anyone has a problem, they cannot be reached from outside. Fainting, heart attacks, or drug related issues. Why don't doors open outwards?

Penny