There are some regardless of your nationality who are exempted from needing a direct airside transit visa (DATV) when passing through the United Kingdom.
The Home Office on their website allow exemption based on the following requirements:
- a valid visa for entry to Australia, Canada, New Zealand or the United States of America and a valid airline ticket for travel through the United Kingdom as part of a journey from another country or territory to the country for which the visa is held;
- a valid visa for entry to Australia, Canada, New Zealand or the United States of America and a valid airline ticket for travel through the United Kingdom as part of a journey from the country for which the visa is held to another country or territory;
- a valid airline ticket for travel through the United Kingdom as part of a journey from Australia, Canada, New Zealand or the United States of America to another country or territory, provided that you do not seek to transit the United Kingdom on a date more than six months from the date on which you last entered Australia, Canada, New Zealand or the United States of America with a valid visa for entry to that country;
- a valid USA I-551 Permanent Resident Card issued on or after 21 April 1998;
- a valid Canadian Permanent Resident Card issued on or after 28 June 2002;
- a valid common format Category D visa for entry to a European Economic Area (EEA) state;
- a valid common format residence permit issued by an EEA state under Council Regulation (EC) No. 1030/2002;
- a diplomatic or service passport issued by the People's Republic of China;
- a diplomatic or official passport issued by India; or
- a diplomatic or official passport issued by Vietnam.
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