Defender TD5 - crank bit won’t start

Hi - my td5 was working fine. Then started hesitating. Now just cranks and will not start. I have been through pretty much everything:

- replaced fuel pressure reg
- new filter and fuel line connectors
- new crank pos sensor
- new intertia switch

Recently has a complete head replacement with reconditioned injectors and new glow plugs. All actuate fine using Nanocom and has been running like a dream until this issue.

Has to be something really silly but cannot work it out…..

When mine didn't start it was the starter motor affecting the CPS signal, pretty sure the engine light came up.

Yeah I wondered about that. Replaced the cps and the starter…. Still no joy.

Like looking for a needle in a haystack! Wondering if a garage professional obd will show more than my Nanocom.

@sierrafery
Might be able to help