I think we need to draw a distinction between a "proper" biscuit, best suited for dunking, and the higher end biscuits which are more of a snack to he had alongside a cup of tea.
I would initially propose that for anything to be considered a "proper" biscuit, it can only be covered in chocolate on one side. Any advances.......
We need to know what we're aiming to achieve and have our selection criteria locked down before we go too far (this line can be used for both conversations)