What you can update
You can make certain changes directly in your Marshmallow account, such as:
Your home address
Your annual mileage
Your occupation
These changes may affect your premium, and we’ll let you know if the price goes up or down.
What you can’t update
Some details can’t be changed once your policy has started. This includes:
Date of birth
Licence details
Convictions
If any of these change, you’ll need to cancel your current policy and buy a new one with your updated information.
In summary: You can update basic details like your address or mileage, but bigger changes (like licence details or convictions) mean you’ll need a new policy.