I am truly thinking that there is a short or a corroded wire. There may be a ground not connecting also. But here are the trouble shooting tips for your landrover.

Engine does not turn over when attempting to start
Check the battery state of charge and condition. If the dash lights are not visible or very dim when turning the ignition key on, the battery has either failed internally or discharged, the battery cables are loose, excessively corroded or damaged, or the alternator has failed or internally shorted, discharging the battery. Charge or replace the battery, clean or replace the battery cables, and check the alternator output.
Check the operation of the neutral safety switch. On automatic transmission vehicles, try starting the vehicle in both Park and Neutral. On manual transmission vehicles, depress the clutch pedal and attempt to start. On some vehicles, these switches can be adjusted. Make sure the switches or wire connectors are not loose or damaged. Replace or adjust the switches as necessary.
Check the starter motor, starter solenoid or relay, and starter motor cables and wires. Check the ground from the engine to the chassis. Make sure the wires are not loose, damaged, or corroded. If battery voltage is present at the starter relay, try using a remote starter to start the vehicle for test purposes only. Replace any damaged or corroded cables, in addition to replacing any failed components.
Check the engine for seizure. If the engine has not been started for a long period of time, internal parts such as the rings may have rusted to the cylinder walls. The engine may have suffered internal damage, or could be hydro-locked from ingesting water. Remove the spark plugs and carefully attempt to rotate the engine using a suitable breaker bar and socket on the crankshaft pulley. If the engine is resistant to moving, or moves slightly and then binds, do not force the engine any further before determining the problem.

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Bonuses and positive feed back are alway's appreciated

Yes Thats why I have suggested going over your wires. pulling out on one of them while trying to start it will tell you. if it wont start when you pull out and then it does when you push in then it is a loose connection. For example, Today at work one of our bus drivers came in when the stop arm would not go out. But then it started working when he showed me. Then it would not go back in. There is a module and a motor in there and two different fuse locations. I slapped around on the box and around the stop arm thinking it was a short. I couldnt get it to power back on. So I took the box off and when I did the stop arm started working. before I got it all the way off. So I started to inspect the wires behind thewre in the harness, then as I was pulling out on the wires a connection that was not plugged all the way in appeared. So i pushed the connection til it clipped back in. From then on I could not get the stop arm not to work so I but the box back up and tested it 20 more times. It was the problem. This is the way your mech has to treat this ignition. and he can test the ignition with a ohm meter to make sure its not bad or it is bad. With that school bus I cant send it out like that or a child could be killed. I wish there was that much concern for your land rover.

Thanks Dan