peugeot 406 2.2hdi?

I have a 51 plate coupé.
Filled up £20 of diesel. It mucked about a bit on the way home. It didn't start later on in the day.
I thought it was crap diesel.I emptied the tank and changed fuel filter. Put in new diesel from a different petrol station, still no joy!!
The in tank pump blasts out fuel no problem!
Inectors chuck out diesel when cracked open!
It will run as long as you put easy start in air in take, as soon as you stop it stops running.
I thought stop solenoid, but there isn't one!
I have also plugged the car in, the only fault is that the drivers seat is not working!
What next?
Many thanks Simon