A hundred UK companies sign up for four-day week with no loss of pay

Commuters in Manchester. To be accredited by the four-day week campaign, companies must demonstrate that they have genuinely reduced hours for workers. Photograph: Christopher Thomond/The Guardian

A hundred UK companies have signed up for a permanent four-day working week for all their employees with no loss of pay, a milestone in the campaign to fundamentally change Britain’s approach to work.

The 100 companies employ 2,600 staff – a tiny fraction of the UK’s working population – but the 4 Day Week Campaign group is hoping they will be the vanguard of a major shift.