A successful Fiance(e) visa application will result in being granted permission to enter and to remain in the UK for a period not exceeding 6 months.
During this time you will be expected to actually get married, or register your civil partnership and to subsequently make application for Further Leave to Remain (FLR) here as the husband, wife or civil partner of a British citizen or settled person.
Remember that until FLR is granted by UKBA, the fiance(e) is not allowed to work.
There is also no access allowed to any public funds until Indefinite Leave to Remain (ILR) is granted.
After you have married or registered your civil partnership, you can apply for permission to remain here as the husband, wife or civil partner of a British citizen or settled person.
This is known as Further Leave to Remain (FLR) and when granted allows you to remain for 30 months and is the starting point for your 60 month (5 year) journey towards settlement (ILR)
Shortly before the end of your initial 30 month FLR period, application can be made to stay for a further 30 months provided all requirements continue to be met.
After completion of 5 years in the UK, as the partner of someone who is a British citizen or settled in the UK, then application for settlement can be made. This is known as Indefinite Leave to Remain (ILR).