Quote:
folks on the continent seem to manage OK without it
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This is not true.
The continental (Schuko) plug has two clips for earth connection on the side, not with a prong. You just aren't connecting them with your shaver adapter.
Since laptops don't have a metal casing you should be fine, but don't take my word for it. I'm not an electrical engineer.
See here:
https://secure.wikimedia.org/wikiped...20050207152227
(earth is on the left and right)