Tipping varies wildly between services and countries – it’s informal, illogical and there’s no set rulebook. But here are a few things to know.

Tipping etiquette in the UK and abroad

Justin Quirk is a writer and author based in London. He’s written for The Times, The Guardian, Monocle, Mr Porter, the BBC and Esquire about business, culture and current affairs. He previously worked as editorial director of Soho House and as an associate creative director of Expedia Group.