When activating the key fob button once, the NSF passenger and the OSR passenger doors unlock.The other two doors remain locked ,the drivers door being unlocked using the key. Activating the key fob twice makes no further difference what soever.Manually opening the other locked door (now they are all open) and by activating the lock button on the key fob all doors lock and the alarm is activated.
The same result can be had using the dash lock mechanism.
Using Hawkeye obtains the same result.

Whilst the fuel flap can be released using the dash button,it cannot be opened using Hawkeye although no faults are showing.
When using the key fob you can clearly hear all door relays .
I understand that the key opening sequence is not as stated by LR,ie press key fob once for drivers door and twice for remaining doors.
I would be extremely grateful for any assistance.

My disco 2 opens all the doors on first press but requires a second press to open tailgate.

Using Hawkeye obtains the same result.

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unfortunately IMO u need new door lock actuators... the BCU which controlls the central locking doesnt store fault codes...if u hear the click it means they get feed so the solenoids within are fubar'd and they're not serviceable.... dig in your pouch, put new ones and all will be fine

Many thanks for your replies. It is as I thought.more £.s.d.