SWITCHING OFF FREEVIEW
The problem is caused by using two remotes, the TV remote and the virgin tv box remote.
One way to use the sources list button (AV BUTTON) on the tv remote which gives a choice of tv, ext, side av, hdm1, hdm2 etc., to select virgin it would usually be hdm1
My tv is panasonic but this also works with my hitachi tv, most TV.s use the same remote these days but the buttons may vary slightly so you need to find the source/av button, usually at the top right on the tv remote.
Alternatively to disable Freeview, Press menu on tv remote
tv-change enabled to disabled using right arrow on remote (this would prevent freeview from working unless you enable it again and may be a disadvantage)
press menu again to exit
The tv should now start up with the virgin tv box.
My wife has the same issue, as pressing the buttons on the tv remote switch it to freeview and she can not switch source easily so I disable freeview and it always goes to virgin tv.
Note-I could not find the Power on preference option-where is this?