American Citizen Services
The U.S. Embassy in London provides passport and consular related services to American citizens in the UK including the Wales area. For extensive information on these services, including information on the Inland Revenue Service (IRS), please see the website of the U.S. Embassy in London.
Country Specific Information for the United Kingdom
The State Department International Travel site provides Country Specific Information for the United Kingdom. You will find information like the location of the U.S. Embassy and any consular offices; whether you need a visa; crime and security information; health and medical conditions; drug penalties; and localized hot spots. This is a good place to start learning about where you are going.