Hi clegsr,
Compatible TV's for IPlayer 4K are listed here uhd-connected-tv (the list doesn't contain projectors)
Have you gone into the IPlayer settings and switched to IPlayer Beta which shows the UHD content? You can play a UHD test loop from there.
Searching UHD at present shows His Dark Materials, Dracula and Dynasties which are labelled UHD. It also brings up Seven Worlds, One Planet and Blue Planet 11 which although not labelled as UHD do play in UHD.
Doctor Who on New Years day will be in 4K HDR on the IPlayer. https://www.bbc.co.uk/news/
The BBC have just provided the following shows in 4K HDR over Christmas on the IPlayer
- the Queen's Christmas Broadcast
- the drama series Black Narcissus
- the natural history documentaries Meerkat: A Dynasties Special, and A Perfect Planet
Dave
The Service you do for others is the rent you pay for your room here on Earth - Muhammad Ali