Oh dear - fantastic security. Thank heavens I don't have children.......
http://news.bbc.co.uk/1/hi/uk_politics/7103566.stm
"The chancellor blamed mistakes by junior officials at HMRC, who he said had ignored security procedures when they sent information to the National Audit Office (NAO) for auditing."
It still begs the question why 'junior' officials had access to this data in the first place!