According to the reports it was 100% against protocol. The only people who were meant to ever make copies of the data were IT engineers but for some reason a civil servant decided they knew otherwise, they copied it and sent it via the post for the third time (it had been sent twice before in the past).
As recently as Monday Inland Revenue were getting flack from a program called Watchdog. In 1 case they highlighted they sent information to a house at a different part of the country that where it was meant to go (a private individual) when the mistake was found (when the persons identity had been stolen) Inland Revenue agreed to send him every piece of information they knew about him. Only thing is they sent it to the wrong person again. They showed the pie of documents and it was as think as a phone book. It contained everything about him that you could ever think to ask.
In another case they highlighted was 2 ladies. 1 who had lived in Britain all her life and another who emigrated here and was given a National Insurance number. Only thing is the 1 she was given was for the other lady. 1 of them had been paying too much tax as a consequence (about ยฃ8,000 too much over the last 8 years) because of that mistake. Now inland revenue are saying they will not give a rebate because they can only go back 6 years.