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As an after thought in regards the the Cam Sensor test ... I seem to recall that they will run without the cam sensor but not the crank sensor for some reason ... which is weird as I've no idea how it knows whether to fire No1 or 4 but some how it does ... it should be the other way around ...

Firstly, congratulations on your good efforts so far ... this is the first time I've tried this sort of remote diagnosis ... usually it ends up like a game of "Chinese whispers" but your doing a good job ... so lets press on ... It would seem you don't have rail pressure and therefore no...

Yes that's normal as it is plumbed to the return circuit ... you can just cap it off with a plastic plug ... if you have rail pressure pushing over the relief you will have fuel spraying everywhere so be careful and don't get too carried away with the aerostart ...

Well that test tells you you possibly have no rail pressure ... to confirm this leave the SCV disconnected and remove the hose from the rail relief at the rear of the fuel rail ... crank the engine and see if there is any fuel coming past ... if it's a trickle the relief is leaking and needs...

Yes it will rattle a bit on start up because it will have max fuel press and push over the rail relief but will settle down and run after a few seconds ... The pedal dance does that but sometimes it doesn't re-learn even though it says 0000 ... speaking from hard won experience !!! Disconnecting...

1000 kpa isn't enough rail pressure to start ... disconnect the SCV plug and see if it starts ... Don't drive it like that though ... It might need a SCV re-learn performed on the ECM ...