Warning over online form for visitors to US

The Foreign Office said those who have not registered are likely to be detained and sent home.
From Monday, Britons travelling to the US on the visa waiver scheme will need to fill in an electronic travel authorisation form 72 hours before their trip.
The information travellers provide is the same as they are required to produce on the forms they fill out on planes flying to the US.
Travellers do not have to specify exactly when they are travelling and the electronic authorisation, which is replacing the on-plane forms, lasts for two years.