See http://www.out-law.com/page-5536
It says "There is no legal authority on the effectiveness of these
notices in email messages;" and "There is no legal authority on the
value of these notices in email communications. When the notice is
added automatically to every external communication, there is a risk
that a court would consider that the venom in your warning has been
diluted," then goes on with a couple of pages of advice about how to
write a useless confidentiality threat, advising people to put it at
the top of the message to force them to read it. Guess I know who I
won't be consulting if I ever need legal advice in the UK.
R's,
John
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