my wife's son came for 6 months hol visa,we had someone to sort the visa out,people say its easy but uk gov have clamped down to much now,one mistake and you loose your money,I could give you a website for someone to sort it if you want,she is thai but speaks good English and sorts uk visas out for people
My thai wife has been in England 12 years now and loves it,be prepared to spend a lot on visas and a lot of stress to go with it, need to learn English language for the tests,good luck