If you are divorced and want to go back to the exact surname you had before you married, you may not need a deed poll at all. Most organisations, including the Passport Office, the DVLA and most banks, will accept your marriage certificate together with your final order (called a decree absolute for divorces before April 2022).
When you need a deed poll instead
The two-certificate route only works for an exact return to your pre-marriage surname after a divorce. You need a deed poll if you want to go back to your maiden name while you are still married or separated, if you want a name that is not exactly your maiden name (a double-barrelled version, for example), or if the name you used before marrying was not the one on your birth certificate. It is also the simplest option if you have been married more than once and want to go back to an earlier name, rather than producing a chain of certificates.
Some people choose a deed poll even when the certificates would do. It is one document instead of two, nobody needs the relationship between them explained, and some banks and insurers process it faster.
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You do not need a reason, or a deadline
A deed poll does not mention divorce, separation or anything else about your circumstances. It states your current name and the name you are going to use. You can go back to your maiden name the week your divorce is finalised, years later, or without divorcing at all. The deed poll is valid as soon as you sign it in front of two witnesses.
What about your children's surnames?
Changing your own name does not change your children's. Changing a child's surname needs its own deed poll, and everyone with parental responsibility normally has to agree. See our guide to a deed poll for a child.