Here are some resources you might find useful:
Thriving at Work - an independent review of mental health and employers by Lord Dennis Stevenson and Paul Farmer.
Money & Mental Health Institute - an independent charity, committed to breaking the link between financial difficulty and mental health problems.
Business in the Community - Wellbeing - various factsheets and resources for wellbeing in the workplace.
MIND - Workplace - resources to help improve mental wellbeing in the workplace from the UK mental health charity.
Headspace - the smartphone app for guided meditation and mindfulness techniques.