@AndrewS2 assuming you have the older analogue phone service the common cause of faults like this is not having a line filter protecting the broadband connection. These days you can get a prefiltered master socket with separate connections for the hub and phone. Otherwise you need a line filter on the master socket. Sky no longer provide these but they can be bought from nearly any hardware store.
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65inch Sky Glass, 3 Sky Streaming Pucks, Sky Ultrafast + and Sky SR213(white Wifi Max hub) main Wifi from 3 TP-Link Deco M4 units in access point mode
