Theresa May was urged by some of Britain's top business leaders to act on the basis of a commitment to impose first mental health care in all workplaces.
More than 50 executive executives in the banking, retail, education and utility sectors signed an open letter to the prime minister, warning that mental health problems in the workplace cost the UK economy nearly £ 35bn , losing 15.4 million working days to stress associated with work, depression or anxiety.
They highlight a signed petition of more than 200,000 people requesting a change in the law for the provision of primary health care for primary care for mental health care.
Stephen Clarke, CEO of WHSmith and one of the signatories, said: "At WHSmith, the mental health of our employees is of equal importance to their physical health.
Each of our 14,000 employees has access to mental health care and we are proud to have the same number of first-aid nurses in our entire business as we do physical health nurses. We call for this legislative change, along with many other leading employers, because we strongly believe that everyone should have access to first-aid health care for their mental health, no matter where they work. "
Campaigners, headed by First Mental Health Help (MHFA) in England, hope that clear support from business leaders could be the catalyst the government needs to push through change.
The Tory Manifesto last year promised the greatest agitation to provide mental health services for 30 years to address the "burning injustice" of current treatment by committing "to modify health and safety regulations so that employers can offer appropriate first aid training and health needs assessments, as they currently do for physical health risks. "
He promised to abolish the 1983 Mental Health Act, describing it as "inappropriate for purpose", instead presenting a bill on mental health.
The movement followed the revelations of Duke of Sussex in The Daily Telegraph that he sought counseling to help understand his mother's death.
Natasha Devon, the mental health campaign behind the online petition, told Sunday Telegraph: "This government needs to know that the business will return to change.
"The answer has always been that they believe that people should do this on a voluntary basis and that they do not want to force businesses, which form an essential part of their support, to do something they do not support.