I have been asked by my current employer to develop a business case for additional Health and Support for my organisation Has anybody got any experience/examples that they would be willing to share with me

Edward is your employer confident that he/she meets all the applicable legal requirements that his company faces? That's a tall order and he should be careful not to focus on the nice things and misses the legally required duties as they can come back and bite you really hard and run the risk of loss of life if the inevitable does occur. Just advise him/her to ensure they meet the legal minimum requirement before trying to achieve the moon in one step.

You'll need some sort of gap analysis/ audit report to inform that business case. Your employer needs to know where he is now and have a good idea about where he wants to be. Without that, your arguments may prove tenuous. There may be supply change pressures to improve. "Support" can take many forms (training, occ.health and hygiene, etc.). It can be resourced internally, by additional employees or via short or medium term consultancy. Time and resources required are entirely dependent on the width of the gap to be bridged. The fact that you've been asked is an initial encouragement, but there may be many other departments within the same organisation busy on their own business case to secure what are undoubtedly limited and finite resources. Good luck!