With immediate effect, all travellers wishing to enter the US under the Visa Waiver Programme will need to hold a passport with an integrated chip (an ePassport). The VWP allows most British Citizen passport holders to visit the US for up to 90 days. British passports issued since October 2006 are ePassports and carry this internationally recognised symbol on the front cover. Please check www.gov.uk/foreign-travel-advice/usa/entry-requirements for full details.