Well spotted. The bare earth should give away the chord type as the photo doesn't.
It's 1.5mm T&E with the Live and Neutral swapped. The plug was actually wired correctly as far as polarity goes.
The T&E was removed there and then and the extension was wired correctly.
the person who made up the extension removed the original chord because it was too short at 3 feet.
I'm now working as a mechanic for a plant hire firm and have come across dozens of photo opportunities in our workshop alone.
Simon.
