Companies in the UK must include certain regulatory information on their websites and in their email footers before 1st January 2007 or they will breach the Companies Act and risk a fine. Although this law came into action at the beginning of the year some companies are still to implement it.
http://www.out-law.com/page-7594
http://www.publictechnology.net/modules.php?op=modload&name=News&file=article&sid=7328