I don't think you can however if BT do charge you then you can claim up to £100 of credit for a Broadband switch as per this:
This link explains what you need to do:
https://www.sky.com/help/articles/switching-credit-offer
You must provide a copy of the bill from BT where you have been charged and a copy of a statment showing that you have paid it and send these to Sky via this email address - switching credit @Sky.uk (all one word without the gap).
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