They are sold at B&Q stores - There is a major design fault with the 5amp fuse in this type of consumer unit, it is very easy to accidentally insert a plug top type of five amp fuse into the holder,
Wrong both you and wholesalers. A plug top IS the screwed cover, it does not have another one. It's amazing that wholesalers don't know what they are selling!
I have to say that I'm the other way around. "Plug top" is just silly and meaningless, and I can't imagine how on earth it came into being. However, even though the meaning of "socket" will nearly always be obvious because of the context, at least qualifying "socket" with "plug" removes theoretical ambiguity - since what goes into a socket could be a plug, but could, for example, also be a soil (or other) pipe, a bolt head, nut or screw, the stump of an amputated limb or countless other things.
Quite. The term just suddenly seemed to appear out of nowhere, for no particular reason.
And just because many electricians and wholesalers might use the term, that doesn't make it right. How many computer stores will sell you an "RJ-45" patch lead for your network connection, or a "DB9" serial cable? Both have come into common usage, and both are wrong.
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