Partner 1.6hdi won't start

[Spanners 64]

Ok , I,m new to the site but not new to pug,s or vehicle's being a semi retired mechanic/ recovery operator
I,v recently aquired a 2007 partner van 1.6hdi
It cranks forever before starting when cold. And cranks forever but will not start when hot
All usual checks have been doing good fuel ,, new filter,,
No air in system,,
Heater plugs working , etc , etc,

I,m suspecting pressure pump ???? Or injector/ injectors

[wheeler]

Can you see the live data of the fuel pressure sensor when its not starting.
Does it fire with a sniff of easy start?