@Andrew1212
You might be able to do this online here:
https://www.sky.com/mysky/tv/tv-packs
If you can't then you need to contact Sky and give them your 31 days notice to cancel it, 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
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