May I know if mr Watson Lan is official payment officer in Natwest bank London?

It's not within my knowledge whether Mr. Watson Lan is an official payment officer at Natwest Bank London or not. However, it's important to verify such information before making any financial decisions or transactions. If you need to contact Natwest Bank regarding a specific payment officer, I recommend reaching out directly to the bank through its official channels, such as the customer service number, online chat, or visiting a local branch.