P38 starting problem

I own a P38 v8 petrol auto, I drove it fine yesterday stopping and starting many times. This morning I went to start it and all I got was a click from the starter relay. I have checked all the relays and fuses and all are ok. I jumped the two connections on the starter relay and the engine turned over, so the starter motor is ok but the engine would not start and run. I then reset the code for the alarm system so that is working ok door lock and unlock on the remote, there are no messages on the dash, can anyone help??