It is the traveller's responsibility to ensure that all travel documentation is valid as airlines will not permit passengers to travel who do not have the correct documentation and who cannot comply with all regulations.  You must have a full Passport that is machine readable and valid for six months beyond your return date.  Children under sixteen (on date of return) may travel on their parents' passports.  If you are a British Citizen, hold a full British Citizen Passport and have the right of abode in the U.K., you will not need a visa.

You will have to complete a free ESTA form online in advance of your travelling www.esta.cbp.dhs.gov. You may also have to complete a visa waiver form before landing in the U.S. together with a US Customs form.  These will be provided by the airline.
 If you do not have a British Citizen Passport, you will probably require a visa, and you should check with the American Embassy Visa Unit on their website www.usembassy.org.uk/cons_new/visa/index.html

Visa Restrictions: Holiday makers may be denied entry due to previous convictions. If a traveller has been arrested or convicted they must apply for a separate visa to gain entry or may be ineligible altogether.  
Check with the American Embassy Visa Department.

Immigration will photograph and finger print all people entering USA.