Two hundred UK companies have signed up to implement a permanent four-day week for all employees at full pay, according to the latest 4 Day Week Foundation data.

Greece has introduced a six-day work week, aimed at improving the country’s productivity. The legislation that allows this is due to come into effect from Monday, 8 July.

The largest global trial of the four-day work week has been deemed a success, as 89% of participating companies have continued adopting the practice a year on, research has showed.

Summer working hours, where employees leave early on Fridays for up to five months of the year, have been found to have positive impact on productivity and retention at companies including Kellogg's,...