I have a created a form that returns information to mymodule_item_form_page.
I have set up through the menu hook access permissions for the items that get returned but I would like to add the ability to allow additional users who would not normally have access to the item to be able to see it.
I have created a table that contains the id of the item and the uid from users,
does anyone have an example of how I can manage access permissions in this way please (i.e. group access + defined users