My wife got fed up of using the Virgin Media Go App as a remote control as it meant a few more clicks before you can even change channel, so I went about trying to figure out whether we can get two remotes linked to the same 360 box. After initially failing to get it sorted, I found a solution that works for us and possibly for any others that experience the same problem.
We have 1 TV in our main living room, 8 metres away from the box, and another TV 2 metres away in our bedroom with HDMI cables running from box to both TVs.
I took a punt and bought a "One For All" smart remote from Argos (c.£20) which is controlled via IR. I was willing to buy this remote as I also have an amp and a Blu ray player which means I can control my TV, Virgin Box, Amp and Blu Ray player using only 1 remote.
The reason why One For All is good is because they have an app you download on your phone and you can input the remote control code to link to the Virgin box. All you do is program the One For All remote with the Virgin Box set as "Ziggo Media" and the code is 1582 (I got the code from someone else on this forum) and it worked! All of a sudden I had an IR remote to the box along with the official Virgin remote (to be used in our bedroom).
The second issue after that was how to get the IR signal from the One For All remote from the garage to the main living room (some 8 metres). You can get some cheap IR buds, but for some reason it didn't work for me.
So I ended up taking a second punt and bought a "Marmitek" IR transmitter and Receiver from Amazon for a reasonable price (they look like two small pyramids). One goes in front of the Virgin box in the garage and the other went next to my TV in the living room. It works well and now I can control my living room TV perfectly using the One For All remote.
Sorry for the long winded post but hopefully it helps anyone if they are still struggling to use two remotes on one box. My solution does mean spending money on a One for All remote and possibly IR receiver but for me it was worth the price and less hassle.