From the maestro himself
(Adrianf36) from a post on AV forums
Sky News is not shown in the now/next or 7-day EPG screens because there is no epg data for it. The EPG data that is parsed and displayed by the WebIf is the Freesat 7 day EPG data. Since Sky News is not a Freesat channel it is not included in this data.
I know that there is now/next information transmitted for non-freesat channels such as Sky News but unfortunately this is not saved anywhere on the Humax (that we know of) for us to pick up and display in the WebIf.
Hope that makes sense.