Who can visit the UK?
Typically, people plan to visit the UK for tourism, for example on a holiday or to see family or friends, people may wish to visit the UK for other reasons too. Anyone can apply to visit the UK, but some nationalities require prior entry clearance (a visitor visa) before travelling to the UK, even for a short period.
A visitor visa is required by a visa national who is wishing to visit the UK. The list of visa nationals can be found in paragraph VN.1 of the Immigration Rules. In contrast, a non-visa national, such as an EU national or US national, can arrive in the UK without a pre-approved visa and will be granted permission to enter as a visitor on arrival. Many UK airports have good e-gate facilities which speed up entry considerably, and are available to a wide range of nationalities including EU countries, the US, Australia, New Zealand, Canada, Japan and Singapore.
UK visitor visas are normally valid for six months and permit multiple entries into the country.