I'm in the US, so I'm not sure what it called in UK but here in the US two people can get married legally/lawfully at the City Hall/Courthouse.
I got married with my then boyfriend now husband at the Los Angeles Courthouse in the state of California, USA
I married him with nothing. No engagement ring, No wedding reception, No honeymoon. With 2 witnesses: my older brother and my mother in-law.
The reason why I choose the quick and simple Courthouse to get married is because my Chinese mother discriminate against my husband becasue he's Black.
There was no point of me have a wedding because NOBODY on my side of the family going to come. My parents didn't give me their blessing, I don't see any point of have a wedding when nobody on the bride side family going to show up.
I mentioned about my Courthouse wedding in the "Husband have baby fever" thread of mine.
Anyways, we are married and we both happy. He sure have baby fever though, but uh.. I'm not really having baby fever.
I don't know what UK called it, perhaps it called "registry office"?
Anyways, what matter is two people love each others. A big wedding, a small wedding, or get married at the City Hall/Courthouse, "registry office", it doesn't matter. What matter is the commitment between two people. Wedding is only one day, but a marriage is a life time.