Can I put a little note here, too? Might help with some of the confusion about terms:
A "visa" is permission to ENTER a country. This is obtained prior to entry. Fiance' visa, spouse visa, HSMP visa - these are all applied for when you are still in your country of origin and CANNOT be applied for in the UK.
"Leave to Remain" is permission to STAY in a country. This is obtained whilst in the country, usually due to a change of status of some sort, i.e. having entered on a Fiancee' visa, you have married and now wish to remain the UK as a spouse.
Spouse Visa is "equal" to Further Leave to Remain as they are both good for 2 years. They are technically the same thing, but the terminology is dependent upon whether you apply for the visa before coming to the UK, or the leave to remain from within the UK.
Hope that helps a little bit?