The WDTV should send whatever the display tells it to send.
I’d be interested to see the EDID data that the XBOX sends.
If you’re willing to post it, you can find out by putting a USB stick on the WDTV.
Go to settings / about / device info
… then on your WDTV remote, press DOWN DOWN DOWN DOWN RIGHT DOWN DOWN
it will save a file called save_edid.bin to your USB stick.
Open that file with the free MonInfo tool and paste the resutls.
MonInfo: http://www.entechtaiwan.com/util/moninfo.shtm
As to issues with NetFlix, that content is secured with HDCP. Google “Xbox One HDCP issues” and you’ll see lots of reports with problems relating to the Xbox’s HDMI passthrough. I’m not sure if iPlayer is HDCP secured – maybe one of our UK folks will chime in on that.
