There are a number of different organisations which help support employers around the provision of skills to help support employees manage mental health and wellbeing with their roles. One example is Mental Health at Work who are a community interest company with expertise around workplace mental health. They design and deliver mental health workshops and webinars to give people the knowledge and skills to manage mental health in their roles.
There is also a very useful website from a social movement which was previously Government funded called Time to Change. Although they are no longer operating, they have some great content including employer resources.
Please note that the RTPI are not affiliated with any providers and you should always do due diligence when selecting any third party support provider.