Why not order the certificate from the local Register Office, asking first if the bride's father's name is correct. If it isn't it's unlikely that they will charge you for it.
The address, witnesses or other details might also confirm to you if this is the correct marriage, there might be many reasons for the name Sarah being in the indexes, such as a badly written name might be badly transcribed, or the registrar might have been distracted and wrote the wrong name down, or Sarah might even be a middle name.
If it were me I'd have to know.