Back in the days of yore at Kinloss, not long after the Nimrod came into service, the station had a policy of flying ground personnel on local sorties. There were lots of takers and understandably some were of the female persuasion. Dress regs were non existent and pax would usually fly in working blue.
Now the toilet in the Nimrod is forward,opposite the front entrance door, with the door opening onto the passageway to the flight deck. If pax needed to use the loo they generally approached from the Tac area,past the beam window seats and the rear face of the toilet wall. Attached to the rear face of the toilet wall was a small aluminium grill, for ventilation, and by happenstance it looked straight into the mirror,above the sink and opposite the pedestal.
Rumour has it that the grill was a popular spot when female pax were caught short. Rumour also has that at some time rules were changed so that WRAFs only flew if there two or more!