The UK Embassy in Laos recently announced that an agreement had been reached to facilitate the legal recognition of a UK marriage between a UK citizen and a Lao citizen. I married my Lao wife in the UK 6 years ago, so enquired whether this can be done retrospectively. They referred me to the Lao Embassy in London, who sent me this list of requirements. It's not exactly clear, so if anyone has done this or can suggest what they mean, I'd be grateful!
Information Note for foreigners.pdf