@Daisy3 if you mean WiFi speeds in your home rather than the speed of the broadband service to your hub then it sounds like tou need to get a WiFi extender or two. Sky have very limited control over WiFi speeds in your home which are affected by the layout,, type of construction and the level of interference in your home.
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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
