hi
normally on the first press the drivers door just opens, second press then should open the passengers and rear door, this is thee normal factory setting, but can be changed to open all at once on the first click, or just drivers door for one click then another for other doors, these setting can be changed via ur land rover garage
but,
if the drivers door doesnt open and the others unlock can be a stuck rod mechanisim on the central locking motor, spray with wd 40 to see if it works, make sure youve got power to the central locking motor, if u have sounds like a supsect central locking motor
hope that helps abit
gary