Flights from Heathrow to Frankfurt and Frankfurt to Buenos Aires were trouble-free. It is 13.5 hours from Frankfurt to BA with little sleep. BA is 6 hours behind Europe (5 behind the UK). Food on Lufthansa was worst I’ve ever had on a plane. Well if they had given me a sausage I could have said it was the wurst! Literally couldn’t tell if it was egg or pasta or something else. Crew didn’t know either. No problem. Plenty of steak in Argentina.