so use the wireless on the virgin modem, and boost it with some additional powerline adapters.
https://www.amazon.co.uk/TL-WPA8630K...e+adapter+wifi
and then get another extra adapter itself, I have the cheaper option and the connection at 500mbps is okay wired and for the wireless it is decent and you don't notice a speed drop (this is what I have got
https://www.amazon.co.uk/TL-WPA4220K...e+adapter+wifi) was in the bargain bin at WHSmith's a while back for £25)