We treat a day off as a law of nature. It's a law of Parliament, from 1871.

There's a quiet assumption under all the leisure-dividend talk: that free time is the natural state, and work the thing that eats it, so if work shrinks the free time simply reappears. The historical record says almost the opposite. Free time, in the shape we recognise, is a modern invention with an author and a date.

The date is 1871. The author is Sir John Lubbock — banker, Liberal MP, naturalist, a protégé of Darwin who studied ants for fun. He introduced the Bank Holidays Bill to the Commons in February 1871; it received Royal Assent that August. Before it, bank clerks worked six days a week, and the country had no shared, legally-fixed days off beyond the old religious ones. Lubbock's Act simply named four days on which the banks would close — Easter Monday, Whit Monday, the first Monday in August, Boxing Day — and in doing so accidentally invented the modern long weekend. The days off were so popular they were nicknamed "St Lubbock's Days." A man had to legislate rest into the calendar, against the grain of the working week, for it to exist at all.

And here's the part the leisure-dividend story should sit with. Lubbock didn't just want people to stop working; he wanted them to do something improving with the hours — he was a scientist and an educator, and the Victorian project around "rational recreation" imagined museums, libraries, self-betterment. That's not what the time became. It became the seaside, the pub, the football, and eventually the television. The gap between the leisure the reformers pictured and the leisure people actually chose is not a footnote. It is the whole lesson: you can grant the hours; you cannot dictate what fills them. Which is exactly what the modern diary shows, with its two hours and 20 minutes of daily television.

Note, too, how slowly even this moved. A day off was not a paid day off. The right to paid holiday crept in later — encouraged by the Holidays with Pay Act of 1938, and not made a genuine statutory floor until the Working Time Regulations of 1998. For most of the story, free time was won in inches, by law, against resistance.

Where does that leave the promise that AI will hand us leisure? Not disproved — but re-framed. Every past expansion of free time in Britain came from deliberate settlement: an Act, a union, a fought-for right. None of it simply fell out of a productivity gain, and the productivity gains of the last century were enormous. That's the perspective, not a prediction. If the dividend is going to be real this time, history suggests it will arrive the way it always has — because someone legislated it — and that whatever we're handed, we'll spend in ways that would baffle the person who handed it over.