Why is there not more ‘annualised hours’ working in Britain?

Annualised hours (AH) contracts offer employers greater control over working time at lower cost. These efficiency gains may also be shared with workers in terms of pay or time off work. Yet AH remains relatively rare in the UK. Though under‐researched, one explanation is that AH normally requires collective bargaining, which is disappearing across most of the private sector, and often high‐trust employment relations, which is in still shorter supply.