At my grammar school, if a boy was caned, a notice would be placed on the notice board outside the headmaster's study: "M Smith has been beaten for smoking" or whatever.
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It was rare at my school (local-authority grammar, mixed, mid-1960s) and discreet, so if word went round it was by the recipient and play-ground gossip. I heard of no more than about 3 or 4 canings in the 7 years I was there. There may have been more but not to my knowledge. If it was a deterrent, it was by unspoken threat!