When the Euro 16 football final went into extra time, and the programme extended, if I went Channel UP so that I arrived at BBC1, it showed the program title on the right as Euro final.
But if I went Channel DOWN (from BBC2) to BBC1, it showed BBC News (ie as scheduled before the football overran) as the programme title.
It might have been the other way round 
Strange ... it presumably gets the programme title from different places in the two cases.
