She viajas a London or any other city in the United Kingdom, you must bear in mind that the 12-hour system is used there, so if you come from a country where the 24-hour system is used, they will hardly understand what you mean if For example, you say it is 22:00 p.m. Continuing with this example, the way they would say it would be 10:00 pm You have all the information in: «Time change and time system in the UK«.
You have all the information in: "Time change and time system in the UK".