Rationisation of necessary regulation help the installer and consumer for a safer electrical installation. I believe if a regulation is clear and complete it becomes easier to comply with.
I would you like to consider removing the detail of the Building Regulations Part P and the electrical part of Part L and inserting it into the British standard BS7671 IEE Wiring regulations. It is known can electricians cannot carry out wiring to home without use of both sets of regulations.
Training courses for electricians are taught, examinations set and certificates obtained without need to know or consult the Part P & Part L regulations which is then a separate examination.
An incomplete BS7671 regulation (without reference to Building regulations Parts P & L ) encourages and provides excuses for not compliance in the building industry.