@KC42 doorbells are frequently an issue as bybdrfinition they are outside the home often on a double brick wall. Not sure why the Sky wifi is apparently weaker then the BT service it replaced. Sometimes its down to positioning or the use of boosters or simply luck. It is worth rebooting your Sky hub to see if it can find a 2.4GHz channels with less interference but tgst can be a temporary solution.
`I would talk to Sky raise the issue with them they can supply a packageccalled Sky WiFi Max which can provide up to e extenders fitting one in the hallway might help. See https://www.sky.com/help/articles/sky-wifi-max
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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
