If you do get stuck with immobiliser reset etc. I can help you out there
Hope you get it sorted one way or another Oli.
I would upgrade to a D3 now
Wink wink.....! (Mine's for sale....)
What doesn't fit the physical head onto the engine or cams??? Are the water and oil paths completely different?
What is wrong with the older head? Is the casting completely destroyed or? Pics would help.