hi
you need to check the fuel pump with a meter and check you have 12 volts at the pump
if its cranking over then its not the security system stopping it as it would not crank
also check you have spark
if the car has stood with anything less than 3/4 of a tank of fuel, odss are the fuel pump has seized and rusted, if cars are stood should always be on a full tank
workshop manuals and wiring diagrams here http://www.jagrepair.com/
ideally you need a jaguar compatible diagnostic read like jaguar ids/sdd or icarsoft lr v3, generic ones will only read engine and not other modules to see where fault is
cheers
Joe