It's the DW8 engine also used in the Citroen berlingo van and a few other vehicles.
The stop solenoid in this instance is coded to the key transponder and acts as an anti-theft device, not allowing fuel through the pump if the correct keys are not used in the ignition.
To cut a long story short, i had to de-armour the pump and remove the stop solenoid - now I have issues trying to find a replacement (ideally one that doesn't have to be re-coded)
The trouble that I am having is that none of the Lucas/CAV type replacements I have tried so far have enough 'travel' to open up enough to let fuel through.
Having spoken to Lucas directly, they tell me that Peugeot (apparently) put their own solenoids onto these pumps, as they have more of a 'throw' on them.
Any more info that could help me sort this would be much appreciated!
