UK passport holders can visit the United States, including Miami, for up to 90 days under the Visa Waiver Program (VWP), provided the visit is for tourism or business purposes. To travel under the VWP, you must apply for an ESTA (Electronic System for Travel Authorization) at least 72 hours before departure. Your passport must be valid for the duration of your stay. If you have visited certain countries like Cuba on or after 12 January 2021, you will not be eligible for ESTA and must apply for a visa. Always check the latest entry requirements on the UK government travel advice website.

There are no mandatory vaccinations required to enter the USA from the UK, including for COVID-19. However, it's important to ensure that all routine vaccinations (such as measles, mumps, rubella, diphtheria, tetanus, and polio) are up to date before travelling. As of 12 May 2023, there is no requirement to show proof of COVID-19 vaccination or testing. It's still recommended to consult your GP or travel clinic for personalized advice, especially if you have underlying health concerns. More information is available on the UK government health advice page for the USA.