If you are a non British citizen or citizen of the Union may be allowed to travel before entering theUK.Popis countries for which visas are required to visit the UK are available on our website, and a list of countries requiring visas to travel through the UK (Direct Airside Transit Visa). Even if your country is not on this list, you need a visa for other reasons, such as getting married in UK.You must apply for a visa in UK visitors to the British mission in the country where you are normally and legally resident. You should plan to apply for a visa well in advance of your planned travel date. Some travel visa can be processed within 24 hours, but others may take longer, especially in cases where an interview is required. The process can take up to several weeks.Once have a valid UK Visa, you must be allowed entry to the UK on arrival unless your circumstances change, that he gave false information, or you did not say entry clearance officer important facts.