Jayach, that is incorrect. The Sky Q boxes still broadcast their mesh network without even requiring a Sky Q router, also Sky Q boxes require that the SSID's are combined together.
The reason I know that Sky Q boxes interfere with Vodafone routers on the 2.4Ghz frequencies as a friend of mine very recently had exactly the same problem with 2 Sky Q boxes. And when talking to Vodafone they were monitoring the frequencies that the router could pickup and spotted that the Sky Q boxes were interfering with the Vodafone router because they were using the same 2.4Ghz frequency to broadcast on.
The problem occurred after a firmware update on the Vodafone router and changed all the frequencies. Because there are only 13 available 2.4Ghz frequencies in use it selected the one the Sky Q boxes were using and made any internet over wifi go to a crawl, even though he had a 70mb/s and 20mb/s connection coming into the router. So basically all I did was split the SSID's on the Vodafone router and changed the 2.4Ghz frequency and hay presto the internet was working fine.
Not even Vodafone support could solve the issue, which is down to them taking out of the router GUI and the Vodafone Broadband app the ability to manually change the frequencies the Vodafone router broadcasts on. What you will also find with the THG3000 that after every firmware update it will select very high frequencies that many devices can't even pickup anymore. That is why you have to use the 4.1.0 Android Vodafone Broadband app to manually reset them.
