The hub 3.0 doesn't currently have controls for MAC filtering (unlike the older VM hubs) which is normally the way to control access, but @Shelke has posted a workaround using IP filtering which you could try:
Disclaimer - I don't work for Virgin Media. I'm just another VM user trying to help out so my answers may be wrong If my answer solves your problem please mark it as helpful as it may help others My setup: Vivid 200 Optical fibre with Superhub 2 in modem mode connected to a Netgear R7000 router. Telewest/VM user since 2001.
Hi there. There's a new app just out called "Wifi blocker". It blocks Individual Wifi. I know the creators of this app are in the process of adding time schedules onto this app. Hope this helps. WiFi Blocker by test-alpha ltd https://appsto.re/gb/BumTjb.i