Anybody that took their partner’s surname when they got married, may feel like divorcing them is simply not enough.
Moving away from association with their name can be incredibly cathartic and can mark the start of the healing process.
In the UK you can use a Deed Poll to change your name to anything you wish, including your maiden name. It costs around £25 and legally, you don’t actually have to use them, but official documentation from them makes it easier to effect name changes with other authorities, like banks, the passport office and so on.
One final tip: if you do decide to change your name, don’t beat yourself up for signing things with your old signature for a while. That mental adjustment takes a little time to get used to.