For the teacher unions, there was a manna-like quality to the Government's bungling over class sizes this week. Over the past few years, despite their best efforts, they have failed to stir public discontent over policies such as the introduction of national standards.
Whatever the unions argued, parents showed themselves, by and large, to be only too keen to know more about their children's progress at school. The Government had good reason to be confident this support would continue as it sought to implement further aspects of its education policy. Now, however, one mishap has brought that expectation crashing down.
In reality, it was always going to be somewhat difficult to sell the concept of slightly bigger class sizes in return for a higher quality of teaching. This went against the classroom trend over the past few decades. It was also easy to argue, with some justification, that the initiative would limit the potential for the one-on-one tuition provided by smaller classes.
Parents were always going to take some convincing even if, as the Government initially suggested, the policy would involve the vast majority of schools gaining or having a net loss of less than one fulltime equivalent teacher.
But any explanation became altogether more difficult when, after the Budget, it was revealed that, because of flawed modelling, some intermediate schools faced losing up to seven teachers. The Prime Minister's subsequent assurance that these schools would not lose more than two teachers over the next three years averted an immediate public relations disaster. It is, however, far from the end of the story.