@Shiekhvie you can see a list of devices connected to your black Sky hub by typing 192.168.0.1 into a browser. However the hub will show what the device reports so it isnt a particularly friendly list. Some devices simply don't report what they are so show as unknown which doesnt mean the device isnt yours.
Sky wifi us pretty secure and unless somebody knows the password they cannot connect if you think somebody has got the password change it to something only you know see https://www.sky.com/help/articles/find-and-change-your-wireless-password
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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
