Well, British people find this quite a matter of great joy and proud that there ancestors, a part of them, have originally migrated to USA long ago. Prior to the US independence, USA was yet another colony of UK like any other parts of the world. And during the colonial time, since some British moved to USA, a sense of sovereignty worked.
Britain and USA have more than brotherly relationship and it is so easy for British people to get US visa. Likely, there will be evidences rare where a US visa is refused to any British. But it does not mean that United States Embassy in London, United Kingdom will tolerate lack of documents, information and evident in support of USA travel purpose. You simply need to get yourself prepared with all required information and documents to get the US visa at first chance from the United States Embassy in London, United Kingdom.
The US mission to the United Kingdom includes many offices scattered throughout England, Wales and Ireland to serve both Americans residing in these regions as well as the local citizens of these regions. The American citizen services are divided in the United States Embassy in London into three units, which are the special citizens’ services, passport unit and federal benefits unit.
These units offer a full range of the services needed by Americans residing abroad of their homeland. There is also a 24-hour phone number directly connected to the duty officer for emergency calls. British citizens can travel to America under the visa waiver program, all what they have to do is to register themselves with the electronic system of travel authorization and then be able to travel without a visa. All services are done in the United States Embassy in London is on appointment basis and with a very limited exceptions on a walk – in basis.