@Silent_Scone /
@Cookie
I *think* the flickering issue is fixed. How? No idea.
I took the monitor to a mate's house and hooked it up to his PC. However, I forgot to take my Display Port cable so I used one of his. His cable was ultra crap quality and didn't like higher resolutions at the monitor's native resolution. But, strangely, after attempting to run the panel at the higher resolutions at a range of different frequencies and resolutions the flickering appeared to stop. Interesting. So... we started at the lowest resolution and frequency and literally went through every single combination the panel is capable of until all options had been exhausted.
I'm happy to say that the monitor now appears to be back in a working state. I've not had chance to try it in anger as yet but a cursory boot-up and examination earlier suggested that it's back to normal. I hope so!