**
UPDATE:** Success!
Ok a little back-story: A month ago, I took the plunge and bought a Rift, in the Summer sale.
I had issues with what turned out to be the HMD cable. I bought a new one last week on a hunch(because I had no disconnect errors and I had consistent audio) and it arrived today. It was my last hope before packing the HMD back to Oculus for them to look at it.
The new cable worked flawlessly with the USB-C to HDMI adapter I bought from Amazon.
I just spent 4 hours setting up my Oculus Avatar and playing my arcade
ROMS in New Retro Arcade.
It felt like one hour. The sun was shining when I began, and it was nightfall when I finished, haha.
I've got about 25 days left of my RMA period for sending my Rift back to Oculus, so I'm gonna wait a few days to see if my current joy is permanent or short-lived.
It cost me an extra £50, but I don't care - it's better than sending the headset back waiting two weeks, only for them to say the headset is fine!
This is the HDMI Adapter that works for me:
https://www.amazon.co.uk/dp/B01MYUCWOK/ref=cm_sw_r_cp_apip_Su9vDQTXBydY3