So I found this information
on this thread...
http://forum.a8parts.co.uk/showthread.php?t=7323&page=2
I am still trying to decipher it, but am wondering if I have the valve block repaired, or source another valve block (Part Number 1058 427 068) could I bolt this to the DYM?
Interestingly the chart show the valve block part code as 327, not 427 as on my cracked block