UPDATE - For anyone at a complete loss as I was, trying every solution on the internet.
I opened the MacBook back up, unclipped the small Touch Bar cable on the top right of the board and wrapped it in masking tape so it doesn’t touch anything it shouldn’t - and the MacBook works as it should, albeit without a Touch Bar.
Mojave OS reinstalled (with a few strange/abnormal/unexpected restarts), updated to Sonoma, no sleep/wake panics etc. At least I can now continue with work!
Hope this helps.