Ok, Doblo all built up ready for customer to collect. They need it back again, so can't do much else with it.
I tested the fuel return pressure and it is sitting at 1bar.
Neil, your correct about the modern cars. Nothing should be overlooked. Customer has been advised about the glow plugs. Hopefully they don't want us to fit them. I've had a bad experience of one breaking
Kim, I can't recall the engine temp, but suspect it would have been with a warm engine. RPM wise I'd be guesing at about 2.5-3000.
Should we get this car back again, or they get it fixed, I'll update with the info.
Thanks all for taking the time to contribute with advice etc.