@Barnzee
Yes to both your questions so this is what you need to do:
Buy the Sky sim.
Activate the sim when it arrives but do not put it in your phone, so keep your current sim in it.
Give the Pac code to Sky
When your current sim stops working insert your Sky sim in the phone.
You can give Sky your pac code online here:
https://www.sky.com/myaccount/mobile/sim/x/my-number/transfer
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