Nope, it wouldn't write a dump file
. It seems that because it couldn't create a swapfile (it would only create a temp swapfile when booting into safe mode) it wouldn't allow dump files to be created. No matter what settings I tried for setting a swapfile, Windows ignored it in the same way it ignored any other changes I tried to make (howsoever those changes were attempted).
The system is wiped now anyway and back up and happily running. Just got a few more things to load (printer drivers etc) and it's then going back to the customer. The customer will be happy it's up and running. I'll still be miserable knowing that I'll never know what caused the problem in the first place
.