It is possible for your Thai girlfriend to join you in the UK, but there are certain requirements that must be met. It is important to ensure that all the necessary documents and paperwork are in order before attempting to bring your Thai girlfriend into the country. Getting a UK settlement visa, which is also known as a fiancée visa, will enable your Thai fiancée to permanently move over and stay with you in the UK. It's a good idea to get help from UK visa pros when you and your Thai fiancée are going through the visa application process - they can help guide you through it.