You also missed an important part about annulment, if the person you are married to hids information about a previous marriage than you are eligible for annulment.

People keep saying that, but that option doesn’t appear on the forms. 

https://www.gov.uk/how-to-annul-marriage/apply-for-an-annulment

https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/688088/d8n-eng.pdf

“Hiding information about a previous marriage” isn’t on the annulment petition. I’ve looked at it. Hiding a marriage would only be relevant if someone was still married to that person while getting married to someone else, aka polygamous marriage. The voidable options are directly posted above.

I can’t even find that on the supporting notes for the petition paperwork, and you can take a look at them here:

https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/688091/d8n-notes-eng.pdf