Mate of mine has just finished fitting a D2 Td5 engine with a de-immobed Defender NNN ECU, Pace Automotive black loom & D2 Red loom & Bosch 044 fuel pump. MIL Light wiring to ignition live & earth

Come to start it and it cranks but won't turn over. As far as we can tell its getting fuel & not leaking, pump is running fine.

Yet to check the crank sensor.

I'm at a bit of a loss here, any suggestions?