Employee wellbeing is increasingly a focus of government attention in the UK and elsewhere. It is viewed as a legitimate target of government policy in its own right, but there are also reasons to think that improvements in employees' wellbeing may be conducive to economic growth. This paper focuses on the subjective wellbeing of employees and its potential impact on workplace performance. As yet there is relatively little empirical evidence on the relationship between employees' subjective wellbeing and workplace performance. This paper begins to fill that gap for Britain