I get the issue with the socket in question, but that issue is separate to the point I was trying (or rather failing) to make.
It was pointed out that CEF is selling a similar product and the implication was that their product would similarly be affected by this earthing issue. This raised the question in my mind whether this was a poorly designed product from one manufacturer, being sold under several brand names, or if there is a good quality original that has been badly copied by someone more concerned about profit than attention to detail.