David,
Thank you for your advice!
I double checked the power, re-seated everything again and examined and re-seated the ribbon cable.
When I turned back on it worked, so it was definitely one of these things. Apologies for not testing individually 🙂 Solved!
Are you sure it's not reporting the same error on driver 9 too?
It didn't report driver 9 , as you can see in the original screenshots - possibly because my config.g doesn't reference it?)