@Eightrax flats can be difficult to network as internal walls are usually solid and there is lots of close neighbours so lots of interference. The answer is normally to get an extender which Sky will supply if you buy the WiFi Max bundle see https://www.sky.com/help/articles/sky-wifi-max or you can buy a two unit third party home wifi system turn off the WiFi on the hub and use thst instead.
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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
