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Thanks, JTH and Ankou. A stag-party or student-rag incident, eh? Very probable. Neither had occurred to me, basically because I didn't study the "women" in the scene in particular detail and so never even noticed that they may all have been men!
I live close to a major hospital and see streams of nurses heading for work every day. I had often thought they could do with a bit more discipline and regimentation such as a drum-corps might provide! That's a joke, by the way, in case any (real) British nurse tries to take me to task over it.
Yes, it was a fascinating programme.