~ Jacks ~
Apologies for changing, I suddenly remembered I had earmarked this shot for the 'J' round.
"Jacking" (i.e. caning) was what we used to get at school as corporal punishment and disciplining. One could expect at least one or two jacks for minor offences and up to a maximum of 6 ('six-of-the-best') for major wrongdoings.
As far as I know, it was outlawed sometime in the mid 90's much to the displeasure of many old-schoolers (myself included :-) )