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This is why I suggested a USB plug with a plastic ground pin first - it's a consumer unit which is only expected to be used with low voltage stuff rather than an extension cord which you might forget about.
The combined PE + N system in the UK is a real problem when you're designing stuff with high loads for outside use. If you have a broken PEN line somewhere it means that your PE line effectively becomes an extension of your neutral return. If you've got a metal casing (think heavy duty catering equipment in a gazebo) which will be grounded internally to the PE - you've now got a fridge in a gazebo carrying mains current through its easily graspable metal handle.
If only our grid hadn't been built on the cheap and they just ran a standalone PE.
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gorgonzolach
Airhead
It all gets too complicated to provide a simple answer doesn't it. I was reading the first few posts thinking 'great, someone on here might know what to do!'. I'm no wiser after the answers.
If you indelibly marked the adaptor as having the earth removed and for use only by a competent person for the specific purpose maybe no one could complain. It's still a socket that is expected to have an earth though. Most people don't realise the earth (or cpc) and neutral are joined in the consumer unit.