Upvote:3
As a general guide, to enter the USA using the VWP a British passport must: - describe the holderβs nationality as a βBritish Citizenβ - be an ePassport. Additionally the traveller must have received authorisation from the Electronic System for Travel Authorisation (ESTA) https://esta.cbp.dhs.gov/esta/
Full guidance is available here https://www.gov.uk/foreign-travel-advice/usa/entry-requirements