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You generally can't get a schuko (grounded) plug into a UK socket as the pins are *just* too wide

It possibly depends on the design tolerance of the components. I just tried a Kopp brand Schuko plug (fairly solid, not the molded sort where the prongs will flex easily) in an old 1960s BS1363 adapter and it went it easily once the shutters were opened.

The same plug in an old MEM BS1363 socket just wouldn't go. Well, it probably would if I'd hit it with a hammer...... [Linked Image]