If you are going to adopt a 'standard' in order to accomodate the above, then you adopt the standard. You don't cherry pick the parts of the standard that you wish to ignore for whatever reason.
I think you can.
To what extent you can then claim compliance with the rest is debatable, as are the words you'd need to use on your notification - maybe instead of "complying with...." it would be more accurate to say "follow the guidance given in...", or "work in accordance with the principles of...".
And whether or not the "cherry picking" does mean that you have made reasonable provision etc etc would be a matter for discussion with LABC.
I reiterate - I'm not saying that you could claim formal compliance with BS7671, but surely you aren't saying that unless I comply with BS7671 in its entirety I'm unable or not allowed to comply with
any of it?
For example what if I did everything perfectly but used pre-harmonised cable?
I agree that LABC might be responsible for testing and certifying the work, but it is still the responsibility of the DIYer to set out the Design and to complete the Construction.
How is the Inspector and Tester to inspect and test without a Design to refer to? If you are going to use a 'blanket' design standard i.e. BS7671 and IEE OSG, then all of both of them must be applied.
Clearly there's a sliding scale of how much expertise, ability to test and how much actual "design" work is needed. Rewiring a house needs a lot more of those than adding a light switch in a bathroom, but both are notifiable and both have exactly the same legal requirements for reasonable provision etc.
So what "Design" would an inspector & tester want to see for the addition of a light switch?
Of course, LABC might accept your cherry picking of BS7671. Who knows? But whether they do or not is a different argument to whether they should.
We could spend forever arguing about what they
should do, but to what end?
In the real world they clearly
do accept that something less than full certified compliance with BS 7671 complies with P1. What I don't know is what words people use on their notification to describe the way in which they plan to comply with it.
It's a better bet to demonstrate compliance with BS7671 as a whole than to cross your fingers and hope your LABC will be weak on the matter.
It's not a question of "weak", it's a question of what they think constitutes "reasonable provision".
Claiming that nothing less than full compliance with BS7671 will do contradicts the guidance, goes beyond what the legislation calls for and means that no DIYer without the ability to carry out testing would be able to do any work whatsoever.
Would you rather people followed BS7671 as much as they were able to, or ignored it completely because they couldn't comply with
all of it?