Posted by evildeeds (423 days ago)
You can apply for a "settlement visa" for the UK, similar to a dependent visa here. He must make the UK his residence, pay taxes there, etc for a period of 3 years which is when he would be able to apply for citizenship.
He cannot leave the UK for more than 180 days a year. During this time he would need to be habitually resident in UK, so as mentioned would be liable for taxes, etc even if that money is earned elsewhere.
(I am based in Hong Kong)