Here are seven behaviors to avoid when traveling to the UK. Don't jostle or push past anyone.
Londoners aren't keen on making eye contact with strangers. Be prepared to validate your card/ticket before entering a bus or approaching a metro gantry. The lack of foresight irritates the British. If you order a lager, it will be between 4 and 8°C - not 10-12°C as the British like to drink. It's not common to say "It's raining cats and dogs" when it's raining in torrents, but "It’s pissing it down" when the rain is torrential. The English are less easy to embrace than the Americans and the promiscuity makes them uncomfortable. They are in a hurry. Tourists who move two an hour or suddenly stop in the middle of the sidewalk to admire the view/take a selfie annoy them. They don't like it when you stop to take a selfie on the street.