Ok, so tried every conceivable OCS / ECS Agnus configuration / Quickstart with the .IPF but still no joy...
I must have tested 10 times and not once did the game make it to the menu screen
I then tried in "WinUAE v4.9.0 Beta 19" and this actually worked first go:
...but there's an issue. Movement is massively delayed, moving down through each option takes 5+ seconds of holding down.
Tested another 3 times, made it to the menu screen again but same issue with movement.
I then tried with "WinUAE v4.3.0". Here the game makes it to the menu screen everytime and also no issue with movement
So the problem seems to be "WinUAE v4.4.0" related.