Yeah sorry guys, I forgot to mention that the socket was from Australia.
Oddly enough, Greg, the screw on the phase wire is meant to be un-done, it is so that the electrician can twist their sub-circuit cable onto that link and terminate it in that tunnel terminal, I believe the other screws on the neutral and earth screws on that particular socket are also loose.
Ragner has it though, the neutral and earth jumpers are installed around the wrong way.
This would have been picked up though in the normal "test before livening" process we all have to use over here.
If that hadn't have been done, the RCD protecting the circuit would have tripped until that transposition had been removed.