@Ashdoug
You might be able to use the messaging service:
There are a few ways to contact Sky about this including using a messaging service as you can see via the Contact Us button under Downgrade here:
https://www.sky.com/help/articles/change-your-package-2
31 days notice is required to cancel it and if you are a Sky Q customer it will means that Sky will send you packaging towards the end of the 31 days to return your Sky Q mini(s), so when you do make sure you keep the proof of posting reciept.
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