Sorry, bit late getting back..
It's been an interesting few days.
Yes, I exchanged the unit and received a new one without issue. This unit didn't have the HDMI or display issue, worked faultlessly for 2 hours until the fan kicked in and sounded like it had no bearings...

I also exchanged this unit, I have just received the third unit, have trialed for two days, the fan is near silent, the HDMI seems to be ok, but this morning coming out of standby the display remained off (everything else worked), cycling power with the remote fixed it. It's only done it once out of about 6 restarts. I can live with this if this is the only issue.
Seems I've had a bit of the bad run on these..