If invisibles work in jobs that are unseen when done perfectly, Oliver Burkeman asks, how do they survive in a culture that seeks endless pats on the back?
Andrew Martin: The suggestion by one of Britain's top doctors that we should switch to a four-day working week is undeniably appealing, and there are plenty of good precedents for it. Could it ever happen?
On day two of the challenge MP David Lammy has his health and wellbeing assessed by Dr Laura Marshall-Andrews, who offers advice on ways to improve his work-life balance