A bigger digression,
SQ were I think the first carrier to serve free drinks in all classes of travel. Traveling BKK - LHR in a classic 747 we were allowed off in Bahrain where the transit lounge was full of oil rig workers celebrating finding a bar after a 3 month dry. At Rome the 'plane half emptied as Aussie-Italians got off, not to be replaced as no traffic right Rome to U.K. After take-off I ask for a scotch & soda.
"No sir, very sorry bar closed. Not allowed to serve drinks on flight to London English rules". Pause "You may have gin & tonic sir".
I am puzzled but accept offer and am served. "How come I can have gin but not scotch?"
"Well sir in Rome we lock away the stock. Not allowed to serve free drinks on sectors to England. Only opened bottles not locked away. I have only 3 more measures of gin and some cognac left sir."
My G&T lasted to Heathrow, Happy Days.