If you have the latest Hub 3 then MAC filtering doesn't work on that hub at the moment, but the second post from Shelke on the thread linked to above has a possible workaround using IP filtering.
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.
I switch my hub off when I'm not using it. Stops any nefarious types sniffing the wi-fi and keeps the electric bill down (not by much though). Not much cop if you have a smart TV though.
-- The only winning move is not to play. No system is 100% secure. The only thing constant - is change. Chris Evans. Ridicule is nothing to be scared of - Adam Ant. I only invent the bomb - I don't drop it. Bryce Lynch.