How to pay no more than the $21 fee. Everyone from the UK going to the USA by air or sea, even those just passing through, must fill out an Electronic System for Travel Authorisation (ESTA) form in advance.
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As of September 2023, UK citizens can travel visa free to 184 countries and territories:
Visa processing takes approximately 21 workdays from the date on which the application is received by the Embassy. A further 2-3 workdays should be allowed for the return of your passport.