Ok so.... The story so far....
I have had the battery out and given it an overnight charge. Multimeter reads 12.34v when connected to the battery terminals.
I have earthed the engine, ecu and gearbox in accordance to deckchair and nickos' guides.
I'm not getting any engine errors in FES. But when I run the RPM actuator test in FES I get the engine fault, altrnter fail, message but again no stored codes.
When I connect the steering to FES I get pwr steering, asr, ebd fail come up on the dash but no error messages stored in the memory.
I don't have the full version of FES so I can only see the CAN info, there is nothing in there that looks incorrect as far as I can tell.
I do have the airbag light on but there's nothing new about that, it's always bloody on!
The car judders but will simply not fire up, there's not been any difference in the sound or motion when trying to start. Is the likely to be alternator related now?
The car has not been jumped or bumped started as long as I've had it. I suppose drop voltage testing is the next thing but this is all new to me so I may have to bite the bullet and get someone out to solve it.
Thanks for all your advice and tips guys, really appreciate the help.