I have an 03 land rover discovery, my wife set the alarm off twice while in the vehicle, when she got it home we got in it to leave a few hours later and starter won't turn, just clicks, was wonde

SOURCE: 1998 land rover discovery won't start

I just expiriance the same problems on my rover so i check it out and found that the engine spark fuse was out. I replaced the said fuse and their you go it started. You can find that fuse under the dashboard in the satellite 1 fuse box. it should be the 3rd one from the right. Good luck buddy hope that helps you out.

SOURCE: problem with my land rover discovery

http://www.popularmechanics.com/how_to_central/automotive/1833626.html

SOURCE: 2004 land rover discovery, ignition

it sounds like your starter motor is faulty. first make sure the battery is fully charged, then place a screwdriver between the contacts of the solenoid on the starter motor, if it again just clicks, then you need to repair or replace the starter motor.
hope this helps

SOURCE: land rover discovery 1996 V8i engine firing order

1-8-4-3-6-5-7-2

SOURCE: on my land rover discovery

lock the jeep. hold in unlock position for 5 seconds, you will hear a beep, enter your unique code in a card in the front of the owners manual, will be something like this.
unlock 4 times
lock 8 times
unlock 13 times
lock 3 times
unlock and hopefully you hear 2 bleeps, now wait ten minutes for the alarm to turn off, the red light on the dash will blink really fast and the hazards may go off once, now you have 30 seconds to get your key in the ignition and start the car. but you need the code, apparently land rover will get it for you but you need indentity and proof of ownership etc.