The rum ration (also called the tot) was a daily amount of rum given to sailors on Royal Navy ships. It was abolished in 1970 after concerns that the intake of strong alcohol would lead to unsteady hands when working machinery.
He’s been very active on tiktok too, singing different versions of these old songs, taking requests, and singing with others. I don’t know anything about his personal life, but in shanties he’s awesome.
My top shantyman, though, is Tom Lewis. https://www.youtube.com/watch?v=PqUNwvOLzpk
Your group sounds awesome! I have always loved shanties and sea-songs; I should look for a local group that takes random idiots.