It's perfectly clear isn't it... depending on whether you sit or stand to pee...where is the confusion?? or maybe it's because I'm a Londoner??

Yes, you're right. It is perfectly clear hwen you see them side by side. I think it might be confusing because people don't see them side by side at first. They see the Mens toilet and aren't sure what it means. When you see the Womens toilet then it all makes sense.