Wow. Three cheers for you, Marlepo!
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That actually made a lot of sense and it looks like the info you got was darned near accurate. Hope you got that person's name!
FLR is not a spousal visa. It is the stamp/visa that allows you to stay in the country for one year after marriage and you get this only if you have gotten a Fiancee visa first.
Spousal visa is what you get in the US if you are married there, and only if you went around the Fiancee visa process.
Easy way to keep these straight is to remember that the Fiancee Visa is applied for in the US, as is the Spousal Visa.
Anything that can be abbreviated (FLR and ILR) are applied for here in the UK.
FLR says you can stay beyond that initial six months on your fiancee visa.
ILR says you are legitimately married and can stay in the UK as long as you wish.