Because London is the largest city in the United Kingdom, and also serves as the capital, it is the most typical point of entry for travelers. As with all international travel, a passport is required for admittance.
Carry the United Kingdom currency (British Pound) when arriving. This rule was placed into affect before the rise in popularity of the ATM. Because of the ease of securing the form of currency, this rule isn't strictly enforced. But it is a good idea to still carry a few Pounds on you before entering. This can typically be done through a money changer in your departure airport.
For visitors from the European Union it is not necessary to acquire a visa when entering the country. Travelers from the United States, South Africa, Australia, Canada and New Zealand will be given a "leave to enter," allowing the traveler to stay in the country for up to six months. All other visitors need to apply for a visa through the British embassy of their own country.
