Interesting - I don't have the little green icon next to Press GREEN to hide.
I have no little green icon and get 'Press GREEN to hide screen.' text (note the added word screen compared to the screen shots in this thread) and no top left BBC DOG
. I'm watching on Crystal Palace using a Sony 2018 UHD TV via DVB-T2 but I have disabled YouView.
I do have connected Red Button and do get the nice (not MHEG5) 'Press green to watch from start' iPlayer icon top right when watching BBC channels.