Ive just found this out but the crank sensor has been replaced by a previous garage, i checked that it is brand new, checked its resistance its also generating a waveform on cranking. Still think that the engine is immobilised because the key light on the dash remains on when cranking, cant see anything on live data on Launch that tells me if the immobiliser is disarmed when connected to the engine ecu, still no comms with the immobiliser.