British Citizen marrying a Taiwanese Citizen

Here you go:
https://www.gro.gov.uk/gro/content/certificates/contact_us.asp
Send them an email: certificate.services@gro.gsi.gov.uk saying you want to order a letter of single status.
Then follow the steps another poster kindly provided in this thread:

Do the community a favour. Post the process you go through step-by-step.

You haven’t mentioned which country in the UK you are from. That would be great information of help to others.

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