The PCC code is clear about uses of misrepresentation and subterfuge to obtain stories. Such antics can be justified “only in the public interest and then only when the material cannot be obtained by other means.” Among the primary public interest justifications are the exposure or detection of crime and preventing the public from being misled. So, have the rules been broken in recent cases such as those involving Edward Terry, Sarah Ferguson and David Triesman? Whether or not technical breaches have occurred, are the rules good enough to protect the vulnerable against irresponsible reporting? BBC Radio 4’s  Media Show invited me to debate these issues with Sir Harold aka Harry Evans, the hugely impressive former editor of The Sunday Times and Times, and David Leigh of The Guardian.