Married in the UK
It depends on where you got married in the first place, if you married in the UK travelling with a fiancee visa, then your Thai wife will be able to get a further two year extension allowing her to live and work in the UK.
Married In Thailand
If you married in Thailand, then a UK settlement visa must be applied for before travel. Being married does not guarantee any visa and many requirements will still have to be met and much evidence provided to get the settlement visa.