VWP is the Visa Waiver Program, which the UK is part of. ESTA is the Electronic System for Travel Authority.
Supposedly you need to apply for it at least 72 hours before check in now, otherwise they won't let you on board the plane.
http://www.fco.gov.uk/en/travel-and-living-abroad/travel-advice-by-country/north-central-america/united-states#travelSummary
@H-Bomb started
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VWP is the Visa Waiver Program, which the UK is part of. ESTA is the Electronic System for Travel Authority.
Supposedly you need to apply for it at least 72 hours before check in now, otherwise they won't let you on board the plane.
http://www.fco.gov.uk/en/travel-and-living-abroad/travel-advice-by-country/north-central-america/united-states#travelSummary