so where in BS7671 does it state that boding conductors to e.g. gas and water should be separate, or , if 1 conductor, should be unbroken/continuous?You can argue as much as you want and dismiss advice here.
The op who posted wanted guidance and if he is going to sit his AM2 and does that he is going to fail.
The issue of you not having the guidance note is your problem ,you can choose to refer to as many books and notes as you wish.
The Guidance note 8 (Earthing & bonding) is an exampanded form ofchapter 54 of BS 7671 2008 amendment 3.
All information in their is correct and binding.