Two numbers from the same file. In 2020, the year Britain locked its front doors, the summed life-satisfaction figure came in at 859.8. The year before, it was 861.9. That is a gap of 2.1 points out of roughly 860 (Source: ONS, Personal well-being). About a quarter of one per cent.

Now the other number. The most recent year available, 2023, reads 429.6. Set against 2022's 860.3, that is a fall of 430.7 points, almost exactly half the total.

One of those movements looks like an event. The other looks like arithmetic. And I think the arithmetic is the more useful story, because it tells you something about how wellbeing gets counted in this country.

Read the aggregation note attached to the series and the puzzle resolves. These annual totals are sums across every category in the file: lower confidence limits, upper confidence limits, quarterly labels, estimate types, seasonal-adjustment flags. Add up all of that and you get a number that moves when the number of published rows moves, not when the nation's mood does. Half the rows, half the total.

The first year in the series backs this up. 2011 sits at 644.6, well below every year that follows, and then 2012 jumps to 859.5 and effectively stays there. The most likely reading is that 2011 is a partial year, the series having started part-way through, and that 2023 is partial in the same way, with quarters still to be added. Nobody's satisfaction with life fell by a third in 2012 and then recovered.

Which leaves the genuinely interesting finding: the middle of this series is flatter than almost any social statistic you will ever see. From 2012 to 2022, eleven consecutive years, the total never dips below 859.5 and never climbs above 861.9. A spread of 2.4 points across a decade that contained austerity, Brexit, a pandemic and the sharpest squeeze on household budgets in a generation. Even the pandemic year only nudges it down by 2.1 before 2021 and 2022 creep back up to 860.0 and 860.3.

Here's the honest alternative reading. It is possible 2023 reflects a real methodological break rather than a simple counting gap, and it is possible the underlying survey did record a genuine decline in that year. Summed confidence limits also hide movement by design: if the lower bound drops and the upper bound rises, the total barely twitches while the actual estimate wanders. So the flatness of 2012 to 2022 is partly a feature of the aggregation, not proof that wellbeing stood still.

That is exactly the problem, and it is my one opinion here. Personal wellbeing was introduced as a serious companion to GDP, a way of asking whether the country is actually doing better rather than just earning more. A published series where the headline annual figure can halve on record counts alone, and where a global health emergency registers as a rounding error, is not going to win that argument. The underlying survey work is careful. The number you can download in five seconds is not the number to quote.