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All of the specifics that follow (including BS 7671) are essentially hints and tips on how that might be achieved, but strictly speaking none of it is required. A bit like the Highway Code.
Ha, ha. If you are willing to stand up in Court and say that then good luck.
The 'Requirements' may not be a legal document but they satisfy the Electricity at Work Act and Part P of Building Regulations if Domestic.
That is a Law. You need to satisfy that Law and following BS7651 (and Part P if you bash domestic dwellings) means you do.
'Hints and Tips' are Kitchen Fitter territory.
Legally speaking Part P only says that electrical installations need to be reasonably safe.
All of the specifics that follow (including BS 7671) are essentially hints and tips on how that might be achieved, but strictly speaking none of it is required. A bit like the Highway Code.
ETA: The definition of notifiable work is also legally binding.