If you are getting married in Vietnam then you will need certain documents for the government. The process is a bit more complicated than in Cambodia or Thailand. Below are the documents that would be need to register your marriage to a Vietnamese. You can also contact the British Embassy in Vietnam for more assistance with your marriage registration. Once your marriage is registered you can then apply for a UK Marriage visa or UK Partner visa. Note that Vietnam now allows same-sex marriages.
Register Marriage Abroad
Much like getting married in Thailand, the process for getting married in Cambodia is very similar. The process has been added below so you can find it easy to follow and register your marriage in Cambodia most likely in Phnom Penh the Capital city of Cambodia. You can find the contact details for the British Embassy in Cambodia elsewhere on this website.
If you are getting married in Thailand (See also here) then you will need to complete the following process for the British Embassy in Bangkok in order to get married. This is from the British FCO in the United Kingdom. There is a PDF made for this process while in Thailand.
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If you are getting married in Antigua and Barbuda then note that the British government no longer issues a CNI (certificates of no impediment) to countries within the Commonwealth of nations. . You’ll need to explain this if you’re asked to provide a CNI or a similar document to prove you’re allowed to marry. You can contact the British High Commission in Barbados for more information.
If you are getting married in Angola to an Angolan national then you will need to contact the British Embassy in Luanda for more information. Note their contact details on this website as well as how to book an appointment online with the Embassy. The details below will explain the process.