HI!
were in the same situation, although my visa wil run out in 2010, but me and my fiance has been working out our marriage plan,if you want it too quickly dont go to the registry officee, as she will be needing a COA, certificate of approval from the home office in the cost of 295pounds,i found out if you get married in the church of england, much easier, go and speak to your parish, no much fuss, than to go in the regestry. hope this help.