The right to privacy is guaranteed by Article 8 of the European Convention on Human Rights.
Article 8 - Protects the privacy of family life. They make specific references to certain aspects of a person's life which are private and so normally deserving of protection.
"Everyone has the right to respect for his private and family life, his home and his correspondence."
Article 10 - They underpin 'public interest' journalism, meaning that it can be legal for journalists to breach someone's privacy, (freedom of expression).
"Everyone has the right to freedom expression. This right shall include freedom to hold opinions and to receive and impart information and ideas without interference by public authority and regardless of frontiers."
Enshrined in the Human Rights Act 1998 - Sections 8 and 10