Hi, this is a known fault with the Disco2 with a spring in the child proof locking catch.
If you can get into the rear of your vehicle you can usually open the door by flicking this latch. You must first remove the rear door seal from the top corner down to the door lock. Next you will need a hooked piece of wire and give the catch a flick. Unfortunately there may be a rubber block between the lever and the side of the car, making this more difficult.
It is an advantage if you can locate the position of the switch before going into the back of the car.
I found that trying to open the door whilst still locked brings this problem on. Also in our case, a good corrugated road releases the mechanism. Having said that, ours hasn't done this for years.
Erich


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