@julie94
The Sky product for that is now WiFi Max
https://www.sky.com/help/articles/sky-wifi-max-parental-controls
The DIY approach is to connect a separate Wireless Access Point (not a router) over ethernet to the Sky Hub, give the kids the password for that, change the password on the Hub and then switch the AP off as desired.
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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
