@Craigdaws
To permanently remove access you'd need to change the WiFi password (and then update it on all the devices which you do want to have access)
If you have the WiFi Max subscription supplement and a white Max Hub then Parental Controls can limit access by individual devices.
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Sky Glass 55" (on ethernet) & two Stream Pucks (one ethernet / one WiFi)
BT Halo 3+ Ultrafast FTTP (500Mbs), BT Smart Hub 2
