You can try this "Installed virgin tv go on to and android phone and with a free app available on the play store called "Apps2Fire", That should transfer it straight over. The base virgin tv go app appears a little odd on the fire stick, lets say squashed, but streams live tv and all catch up perfectly. To navigate the app you will also need to download the mouse toggle app but that is also very easy to use."
But to note that it isn't supported by Virginmedia so any problems with I am afraid you would be on your own.
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VM don't intend for the Go App service to be used with larger screens, just mobiles and tablets, they have the option of extra boxes for other rooms, for a fee naturally, that covers that. That's why the Go App isn't available on Streaming Boxes/Sticks and there is no Casting or Screen Mirroring facility.
@Lozsta - is your Virgin TV Go still working on the Firestick? I got mine working just before Xmas but have come back to it tonight to find it NOT working. Reinstalling the app and clearing the cache didn't help. 😞