What want to hold a marriage ceremony license contained by UK? Vietnamese citizen requirements to marry British national contained by london?

I am Vietnamese citizen. My partner is British. We both live in Shanghai, China. We want to get marriage ceremony in London and have English marriage ceremony. What do we need to prepare for applying a marriage warrant in UK?
First you need to convince your partner that you are not in recent times looking for a marriage of convenience, then you will obligation to convince the registrar. You have not convinced me yet.

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