If you originally used your marriage certificate as documentary evidence of your change of name you will be able to revert to the name you were using previously by presenting your decree absolute to all of the organisations which hold your personal records and you will not need a deed poll.

If, however, you had to execute a deed poll in order to achieve your current name (e.g. you double-barrelled), you will not be able to revert to your former name using your decree absolute. You must execute another deed poll to officially change your name back to the one you were using before getting married.

Note: You can only use a decree absolute to change back to the name you were using immediately before marriage. If you want to make any other change (adding a middle name, changing to your birth name which is different to the name you were using before marriage, etc.) you will need to execute a deed poll.