il have a look into that misplaced earth thing.
my mates having words with the place that sold us the ecu, but really i cant see it being that as if it was i wouldnt get the fault codes through surely?
crank position sensor seems to be working. no fault codes when plugged in, take it off and get a fault code.
and as for the price of a conversion do it yourself probably cost you around £1500-2k if you do things on the cheap.