Other than computers and some audio gear (rackmount guitar effects), I haven't seen applicances with detachable cords in quite a while. I do remember when percolators and radios came with such leads, but they were always ungrounded. Are your kettles grounded or your computers ungrounded?
Whether the kettle's earthed depends on the kettle (some have plastic bodies, some metal). All sockets are three-pin in the UK, so it doesn't make a difference either way: I'm pretty sure the earth pin on the plug is connected through to the other end of the cable, but there's obviously no requirement that the appliance should use it.
(We call it "earth" in the UK; "grounding" is just for rebellious teenagers. :) )
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(We call it "earth" in the UK; "grounding" is just for rebellious teenagers. :) )