I have experienced this a few times. Teh first time was in a public toilet in St James' Park in London. I went into the gents and f8und a lady mopping the floor. I was a little surprised at first, but carried on regardless, peeing at the urinals. She was behind me, but she moved to mop the floor next to me, so she was quite close. I don't know how much she saw, but I wasn't hiding anything.
The second time, I was stood peeing at a urinal in toilets in Legoland Windsor. When I was mid stream, a young lady suddenly appeared from the service corridor which was just to my right. She walke