Or just make one with croc clips, and a hinged cover with a switch to isolate when open.
The reason these were common in the UK is that up until the late 1970s (maybe early 80s) , it was normal for appliances in the UK to come without mains plugs, so they were very common in repair shops and even at retail counters for testing new products.
The two common types were the "safebloc", similar to the ones you still see and the more stylish looking "keynector",
which had larger levers and instead of a cover, a latch that went into the back to turn it on and prevented the keys being pressed down when on. The keynector was more satisfyingly dangerous as there was much less clearance between the contact and the outside due to the lack of the cover.
This was a hang-over from when the UK transitioned from using round pin plugs to the current 13A style. This continued way longer than it needed to as manufacturers didn't want the extra cost of fitting plugs, the argument being that the customer may have old style sockets.
It only stopped when legislation was introduced due to several deaths caused by wrongly wired plug.
There is still a small hang-on from this period in that the ability to "wire a plug" is used as a basic measure of electrical competence.
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