While I agree that a "mistake" like this should never have happened, I don't really think there's much to be worried about.
If, and I mean IF, the data were to fall into dodgy hands, there's
twenty five million people to steal the identities of. The chances of it being you are slim as hell.
In fact, you're way more likely to win the lottery, seeing as that's only around 14 million to 1 odds
