Thanks for your question.
The UK Government does not restrict persons from holding Dual Nationality, therefore, if your partner chooses to retain Laos nationality, he is doing so at his own risk.
The UK Government will not prevent him from entering the UK if he is a UK Citizen, however, he may get into trouble with the Laos authorities if they are to become aware of his dual citizenship.
I hope this answers your question. If so, kindly click accept.
If you wish to dsicuss, please feel free to ask further questions.
DISCLAIMER: Answers from Experts on JustAnswer are not substitutes for the advice of an attorney. JustAnswer is a public forum and questions and responses are not private or confidential or protected by the attorney-client privilege. The Expert above is not your attorney, and the response above is not legal advice. You should not read this response to propose specific action or address specific circumstances, but only to give you a sense of general principles of law that might affect the situation you describe. Application of these general principles to particular circumstances must be done by a lawyer who has spoken with you in confidence, learned all relevant information, and explored various options. Before acting on these general principles, you should hire a lawyer licensed to practice law in the jurisdiction to which your question pertains.
The responses above are from individual Experts, not JustAnswer. The site and services are provided “as is”. To view the verified credential of an Expert, click on the “Verified” symbol in the Expert’s profile. This site is not for emergency questions which should be directed immediately by telephone or in-person to qualified professionals. Please carefully read the Terms of Service (last updated February 8, 2012).