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The only problem with this shutter design is that it makes it easy to shove a euro plug into the socket without an adaptor, as said by John ward.
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Some of us would view that as a benefit/convenience not a problem!
I've not seen a "dimmer-adaptor" like the one shown; I'm intrigued - presumably the bit-with-the-knob is a traditional thyristor-dimmer, wired in series with the live-pins on the 'adaptor' bit?
I remember a similar sort of "regulator" thing - in traditional brown Bakelite - from my youth. It looked like an oversized 13A adapter but only had one socket-outlet, and a knob/dial on the top along with a little window through which a neon-bulb would glow. It was used to regulate the heat to infra-red heater-bulbs in lambing-pens. As the weak lambs got stronger the control would be dialed-back because they no longer needed so much radiant heat to keep them alive.