Thousands of UK workers are starting a four-day week trial from Monday. About 70 companies are taking part in what is thought to be the world's biggest pilot scheme into the working pattern over the next six months. The experiment has been organised by a group campaigning for a shorter working week, but for no loss in wages. During the trial, employees will get 100% pay for 80% of the hours they would usually work, with the aim of being more productive. Academics from Oxford and Cambridge universities, as well experts at Boston College in the US, will manage the experiment in partnership with the think tank Autonomy. Companies ranging from office-based software developers and recruitment firms to charities and a local fish and chip shop are taking part.