Mrs Malaprop has never been more at home than in the Royal Navy ; the Naval equivalent of Jankers, Number Nine Punishment, involving loss of liberty,extra work,and stoppage of rum / beer rations (something with which I was all too familiar !), was " awarded" to those known as "Men Under Punishment And Stoppage Of Leave", which was always altered to "Men Under Nourishment And Stoppage Of Cheese".
    There was also Number Ten Punishment, which generally involved a fine , or "Mulct" as it was known,and loss of liberty,but without the indignity of the menial chores ,or "Jankers ", although I never once heard it referred to thus in the Fleet Air Arm. I was "awarded" 3 days "Noz Tens" for delaying an aircraft carrier which was about to depart Devonport for a NATO exercise in Arctic Waters ! --methinks I got off lightly,although probably because I played the banjo in the ship's Irish/Liverpool "Folk Group" , and the "Joss Man" ( Master-at-Arms) had a soft spot for me / us !! God bless you,Paddy Calnan,wherever you are !!