I disagree: on a residential course, it should be perfectly possible to designate duty staff and for non-duty staff to go for a beer or two.
That said, on summer camp last year the definition of the supervision ratio required plus the need for male and female duty staff didn’t give much time off in the mess. But I did manage a couple of beers during the week by creating and publishing a duty rota. It required a duty officer, duty driver and duty ‘other gender’ officer, IIRC, plus one more for ratios as we had >30 cadets.
(I don’t know why 1:10 still applies during non-working hours: in fact, I suspect it doesn’t. For comparison boarding schools run over night on about a much higher ratio perfectly safely and legally.)
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