If your BritBox subscription is billed through Apple TV Channels as an add on, you'll need to contact Apple directly for help with your subscription.
Apple can assist with questions about your:
- Billing and charges
- Canceling your subscription
- Refund requests
- Subscription management
- Account access related to your Apple TV subscription
You can contact Apple Customer Service or find additional support by visiting Apple Support at https://support.apple.com/.