My 2000 D2 Landrover TD5 awoke us Sun night with the horn blaring at 2am. Went on for about 10 minutes before I got it off by puting the key in the ignition (remote keypad didn't seem to disable it). It wasn't the actual alarm as the lights weren't flashing and the engine would actually start while the horn was blaring? Went back to bed and it happened again about an hour later. Found a spanner and disconnected the battery. Next morning got it running and used the car. Mon night the whole thing happened again and I disconnected the battery again. Vehicle now parked down the back with the battery disconnected. Any suggestions? Could it be linked to a loose positive battery terminal lead as even when the hex nut is completely tight, you can still just turn the clamp on the terminal??