[NeedMoreTea]

There was a decent BBC documentary about this fairly recently. From memory the 40% reduction in working hours caused low single digit drop in productivity. Wouldn't be surprised to find if it were repeated without all the personal impacts that the three day week brought to find productivity rise markedly.

Here's a government pdf on productivity. The three day week doesn't stand out on any of the graphs, it's just lost in the regular variation.

https://researchbriefings.files.parliament.uk/documents/SN06...