I have read the doubts expressed on this forum (and others) concerning the slippering of secondary school girls and again confirm that it was not uncommon, as befitted the disciplinary environment of my time at school (1960s).
In my own case I received corporal punishment only once and that was as a girl in the third year (now known as Year 9) at a school in N.W. London in 1966. My slippering was for a known offence (truanting from p.e. lessons) and was accepted by me as being justified and reasonable in the circumstances.
The punishment was formally administered at the end of a p.e. lesson by the male head of the department. I was told to wait in a room next to the changing-room while the slipper (which was about a mans size eleven) was fetched. I began to tremble when I saw it and was in an even worse state when informed that I was to get six on my bottom (I was wearing my p.e. kit which consisted of t-shirt and gym knickers) and was then told to bend over and touch my toes. The slipper stung and left a warm glow in my bottom afterwards.