Mind you, then the urinals would be out of bounds no doubt.
Prior to the Queen Mum's visit to Scampton in '59, the Royal protocol guys turned up in force to check out the routine and facilities for the day. In the OM there was a toilet at the end of a passage way which was designated the Queen Mum's toilet, if required. With the door shut a protocol chappie stood over the toilet and poured in a jug of water, meanwhile another chap slowly walked away from the toilet until he could no longer hear the running water. At this point a white line was drawn across the width of the passage way, over which, should the Queen Mum be in-situ no one was to cross.
Apologies for thread drift but I just wanted to illustrate that, even during 'The Cold War', we still stuck to our standards!