Hi Daz, have you checked the power and ground on the ignition amplifier? +12v on pin 3 and ground on pin 1 and a pulsed Vdc on pin 2 when the engine is being cranked over, if there is no pulsed Vdc on pin 2, either the immobilizer has'nt recognised the key or your ecu is dead.
nige110162(at)hotmail.co.uk
nigel
December 2009