Quote Originally Posted by Moodybluebird View Post
On the Virgin box there are 3 spare Ethernet (?) ports (yellow) and 1 spare Tel input.

On the back of the soundbar there are no HDMI inputs. There is a co-axial input, an optical input and a small audio input.
How is the TV connected to the soundbar now? If you unplug the TV end of that cable, can you plug it into the Virgin Box directly? Does that give anything out of the soundbar? If not, try changing the Virgin box sound settings as suggested by Maccy Blue.
If it does work like this, then next step to try and get it working would be Virgin box -> TV -> soundbar.