I've had another look underneath the car today and I'm 99% certain that the trolley jack hasn't damaged anything underneath apart from the skirt, though it did come down with a hefty bump.
I've got a fuelab FPR with gauge that I'll pop on there tomorrow just to check the fuel pressure. Earlier today I checked and cleaned the coilpacks and all of the easily accesible connectors in the engine bay. Whatever the issue is it does seem to me around the area of the rear of the engine on the passenger side.
The aftermarket gauge is in psi so where initially I thought it was reading boost fine it actually blips just slightly above '0 psi' so there must be a boost leak, though every single hose, coupling and pipe has been checked and double checked. I suspect that there may be a hose or something loose at the back of the engine or quite possibly the passenger side turbo is playing up (though I don't think that this is the case).
I've spoken to a mate of mine who runs a local garage and he's offered to take a quick look, though by his own admission he's not an expert on the VG30DETT.
This may be a case of getting it up to Zedworld and letting them take over and sort it whilst I move house