they must be unswitched sockets from a time when SP switching of sockets was more common than nowadays, the original MK Logic were SP switching for many years, one reason I didnt like them, but I did prefer Contactum and Crabtree and this was one of the reasons. So having to unplug gives you disconnection in both poles irrespective of make.
I did once do a plug and socket on a boiler but I craftily run a fixed earth by separate means and waited for the LA Grants officerr to comment about possible lack of Earth , but he never mentioned it) He was a former plumber so I thought he might be keen about that one.
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