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iconv -f utf8 -t utf8 <dodgy_file> || iconv -f iso-8859-1 -t utf8 <dodgy_file> > <utf8_file>

perl -MHTML::TreeBuilder::XPath -e'$t= HTML::TreeBuilder::XPath->new;
$t->parse( "<html><body><p>para &copy;</p></body></html>");
$p=$t->findvalue( "//p"); 
print $p, "\n";'

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perl -MHTML::TreeBuilder::XPath -e'$t= HTML::TreeBuilder::XPath->new;
$t->parse( "<html><body><p>para &copy; &mdash;</p></body></html>");
@p=$t->findnodes( "//p"); 
print $p[0]->as_text(), "\n";'

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perl -MHTML::TreeBuilder::XPath -MHTML::Entities -e'
 $t= HTML::TreeBuilder::XPath->new;
 $t->parse( "<html><body><p>para &copy; &mdash;</p></body></html>"); 
...
 $out= $p[0]->as_text; 
  encode_entities( $out);
 print $out, "\n";'