At a guess I expect the "leaker" of personal details was about
SEO level, unsupervised, output not checked, late at night.
And what will happen to him/her/self-identifying as/ ?
Very very difficult to sack, although such an error in the real world would call for it. Admonished, moved sideways, unpromotable probably.
I was such a civil servant, MoD. My output, and my people's output, was checked and signed for routinely.
The culprit certainly made a bad mistake, but the process was flawed, so somewhere up the chain is another person about to have a hard time.
If the civil service is to get the kick up the arse we are promised, the kicking could start here.
I do not hold my breath.