Nationals from the following countries will need a visa to enter the UK:
Afghanistan
Albania
Algeria
Angola
Armenia
Azerbaijan
Bahrain
Bangladesh
Belarus
Benin
Bhutan
Bosnia-Herzegovina
Burkina Faso
Burma (Myanmar)
Burundi
Cambodia
Cameroon
Cape Verde
Central African Republic
Chad
China, People's Rep.of
Colombia
Comoros
Congo, Democratic Republic of
Congo, Republic of
Cuba
Djibouti
Dominican Republic
Ecuador
Egypt
Equatorial Guinea
Eritrea
Ethiopia
Fiji
Gabon
Gambia
Georgia
Ghana
Guinea
Guinea Bissau
Guyana
Haiti
India
Indonesia
Iran
Iraq
Ivory Coast
Jamaica
Jordan
Kazakhstan
Kenya
Korea (Dem. People's Rep)
Kuwait
Kyrgyzstan
Laos
Lebanon
Liberia
Libya
Macedonia
Madagascar
Malawi
Mali
Mauritania
Moldova
Mongolia
Montenegro
Morocco
Mozambique
Nepal
Niger
Nigeria
Oman
Pakistan
Peru
Palestinian Authority
Philippines
Qatar
Russia
Rwanda
Sao Tome & Principe
Saudi Arabia
Senegal
Serbia
Sierra Leone
Somalia
Sri Lanka
Sudan
Surinam
Syria
Taiwan
Tajikistan
Tanzania
Thailand
Togo
Tunisia
Turkey
'Turkish Republic of Northern Cyprus'
Turkmenistan
Uganda
Ukraine
United Arab Emirates
Uzbekistan
Vatican City (service & emergency passports only)
Vietnam
Yemen
Zambia
Zimbabwe