I am about to apply for a fiance visa for my gf.

Supposing she gets this and then comes here in a few months. Her initial stay will be for six months in which time we have arranged to marry.

I believe another visa (marriage visa) is then required for her to remain here once her fiance visa has expired.

Is this the case and does this second visa cost the same as the fiance visa, approx. £500 ?? Will she apply for this here in the UK?

Regards
Joe