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Those in the UK under a visitors (tourist) visa are prohibited from getting married in the UK. The conditions of his visa would have been made clear to him on entry.
To be allowed to get married in the UK he needs to apply for what is called a marriage visa, which is similar to a visitors visa but for the purpose of marriage and then he must leave the UK. He could also apply for a fiancee visa which allows him to come to the UK get married and remain in the UK but he will have to apply for a spousal visa when he is in the UK. The 3rd option is both of you get married in America and then he can apply for a spousal visa in America.
Absolutely well understood.
It can take up to 6 months and he would be allowed to remain the UK. The route you take should be based on your circumstances and you finances really.
I am only able to assist with immigration related matters and not business issues I am afraid.
Please could you rate.