You can cancel a new Premium subscription within 14 days of ordering it and they will refund your subscription. After 14 days they will not be able to refund your subscription. If you have an auto-renewal Premium subscription, you can cancel your renewal at any time up to two working days before the renewal date. To do this please email them at customerservices@os.uk, and include your login email address and renewal date. If you have purchased a subscription through the app, it can only be cancelled through the app store provider. Please check the help for the relevant app store.