My Uncle was in the Royal during the last war,
He served on board many ships including the Rodney and the Trinidad.
The Oggy or Pasty he used to buy from a seller at the Devonport Dockyard gates after a run ashore came in two sizes the four oared oggy and the six oared oggy
Cyril would have known this man who gave up selling somtime after the war I believe.
Cyril wrote Diesel and Shale as there had never been a shanty for submarine's before.
SHALE is shale oil a lubricant that did not smell very nice.
If "Train Wreck" put you off how about S**t on a Shingle, Minced [or ground] beef on toast