In the FAQ we have info about visas and more. I think you should consider the UK Marriage visa.

You can also consult the Guide to London with info on visas, entertainment, jobs, housing, and more.

 

Are you working in the UK?

If you are (or if you are studying, or self-sufficient) then after the marriage she can apply for an EEA residence card. That will give her five years residence as your EEA spouse. At the end of it she can apply for permanent residence, and one year after that, for British citizenship.

If you are NOT working in the UK, but have at some stage worked a consecutive five year period, then she can apply for further leave to remain as your spouse. However you would then have to show that you meet the minimum income requirements and that she is in the UK legally.

So it is easier (and also much cheaper, since the EEA route carries no Home Office fee) if you are working, whether that's full or part time, as that would entitle her to remain here without a minimum income requirement and without so much hassle and expense.