GVG,
Well, finally. I've been dreading a Jaguar fuel injection problem since the forum started. I fear we will not be able to accomplish much via post and repost. The problem is that fuel injection systems like this have about four symptoms and two hundred and fourty one causes. It sounds like your injectors are simply no operating, though I don't know for sure. This could be anything from a vacuum leak at the air flow meter to an electronic processor problem to a bad relay. I'm afraid you need a man (or lady) with test equipment and experience on your particular system, to look at your particular vehicle.
Alternatively, if you are the adventurous sort with a pretty good understanding of induction theory and some basic test equipment of your own, you can go to one of the Jaguar specific web sites such as jag lovers and search their extensive archives. Otherwise, I suggest you seek out a technician and come to a firm understanding of what results will cost, and how much you will pay for diagnostic work.
Yes, I have worked on these cars, but I don't feel comfortable sending you on fishing expeditions with expensive bait over the internet. Good luck, and let us know how it's going. If you repost with what you are being told and what you are being quoted for the work I might be able to help you be a wiser consumer. That's the best I can do.
Motorbill
From Lola to Land Rover, If it's British and has wheels, it's likely I've bloodied me knuckles thereupon