I have followed the story - but not closely enough to understand quite why it has come out now, after all this time.
I have always been baffled by the unwillingness of politicians to apologise, taking matters to almost Fawty-esque limits in an effort to try and extrcate themselves from situations when a simple apology would have saved time and money, to say nothing of saving face.
I believe that people fundamentally accept an apology made sincerely for an error, because we all make mistakes, that's why they put rubbers on the end of pencils.
Ms. Harman has continued to deny her part in this dreadful business, while her successors in the organisation have no problem apologising for the last actions of that organisation.
In doing so, she has painted herself into a moral and political corner, where the time for a genuine apology initiated by herself and her husband has passed, and now anything she says will look grudging, mealy-mouthed, and insincere - all of which it will be.
So, in common with most of her ilk, I suspect Ms Harman will attempt to tough it out even further, and attempt to salvage any shreds of her moral reputation that may still be left by simply allowing time to pass.
Ideally, this should be done outwith the high profile arena of fornt-line politics - she should follow Tony Blair's example.