Hi the next thing that I would try is the crank shaft sensor. I have recently done one like this where it would start happily on easy start but not normally. Fitted new crank sensor and it now starts first time every time.
I hope this helps and if I can help further please feel free to ask
Hi you gain access to it from underneath the van and its on the front of the gearbox on the bell housing. It's just a bit tight but held in place by a 10mm bolt.