Quite a few times when leaving or arriving just as someone was moving in the opposite direction.
Worst times were at the Claude Road place. There were three bedrooms there, Uncle's room, the girls sleeping room and the working room.
Usual form was that if the girl was busy you sat in the kitchen chatting with Uncle until the girl called out, then you hide in the bathroom until the previous customer left, that was nice because the girl would rush in for a quick shower and sometimes never asked you to leave. One time I didn't wait for Uncle to say anything and just headed for the bathroom and walked in on a previous client/ or next client in the shower! That took us both by surprise
Another time I strolled in through the kitchen door and uncle just told me that the girl room was in the room, so I wandered down and walked into the working room to see her hard at work. He had meant wait in her bedroom until the previous guy had finished.