The unwritten rule is if your Thai partner spends the full six months in the UK on the tourist visa then they have to spend 6 months back in Thailand as the rule is one visa in a one year period, the reason is UK tourist visas should not be used for residing in the UK with your UK partner they are for visiting and holidays, so remember the rule unless it has mitigating circumstances one visa in a one year period. Visas to the UK can have many pitfalls
How long should be wait before applying for another UK tourist visa?
