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It is not nonsense, protective conductors have got to be continuous.
It is up to you if you want to use one conductor for water and another conductor for gas but continuity is key no breaks at all.
Guidance note 8 (earthing & bonding) page 57.
Yes it is nonsense, your post clearly stated that main bonding must be one continuous conductor and not two separate conductors.
There is nothing in the regulations or guidance notes to support this.
Main bonding can be two or more separate conductors, and it is often better to do it this way unless items requiring bonding are close to each other.
Following your suggestion of one continuous conductor for all main bonds would lead to an excessively long bonding conductor linking gas, water, ducting, structural steel, lightning protection etc etc, utter nonsense.