The government have released a guidance document on the contents of your first aid boxes.
It is important to remember that this is of course guidance.
And although there are some essential items that should be included in your first aid kid.
What you include, where you locate and how many of first aid boxes are available depends on your individual setting and the constraints of your building.
Please find the link here:
Good practice point - Monthly checks and replenishing of stock is great practice. That way you can monitor that first aid box usage is appropriate for the injury needed. But also you are never left in a position where you need something and it is not available.