the problem with your suggestions (i.e. the making a kitchen not a kitchen, while you fit the electrics and John's 'replacing a damaged cable...one at a time), is that you are doing what BAS is complaining about - you are trying to make the law fit what you want to do.
It's not a case of "making it fit," it's just following the exemption rules of schedule 4 to the letter in the same way as the things you suggested.
The definition of a kitchen in schedule 4:
4. For the purposes of this Schedule—
“kitchen” means a room or part of a room which contains a sink and food preparation facilities;
So leaving aside the question of what "food preparation facilities" is supposed to mean, clearly if the room does not contain a sink then it is not a kitchen for the purposes of schedule 4. The definition doesn't say anything about whether the room
was a kitchen, or whether it
will be a kitchen when all works have been completed, or even whether there is any intent for it to be converted to a kitchen at some future date. It refers only to the present condition, so if there is no sink fitted in the room, then it isn't a kitchen at that precise moment in time, so the condition in 2(a) is satisfied. That is what the letter of schedule 4 says, just in the same way as the letter of schedule 4 allows one to replace every single socket, light, and light switch in the house under 1(a) and every single length of cable under 1(b) in your hypothetical example.
In my opinion, they were trying to allow Mr un-qualified homeowner to do some minor electrical work without having to fork out loads of his hard earned cash - and that's what should be kept in mind when reading Schedule 4 - otherwise, as I've tried to show, it gets silly.
But isn't that a case of trying to "make it fit" to what you think should have been said, or what you think the basic intent was?
To cite an example I mentioned here recently, a few months ago I installed a new ceiling fan in a living room which involved adding a joint box to an existing lighting circuit in the attic and running all of about 6 ft. of cable. Had it been a new light fitting, then I'm sure you will agree that it would have been exempt from notification by way of 2(c)(i), and in fact I could have added a switch and run the switch loop cable as well and it would still have been exempt. But because it's a fan and not a light, 2(c)(i) doesn't apply. Clearly the job was as minor as if it were a new light (more minor in fact, if the light had involved extra switch wiring). But there's no exemption for adding that ceiling fan in schedule 4.
The guidance notes, provided by the secretary of state (Document P), the IEE, (EGTTBR) and other documents from the LABC and scheme providers are written to try and make understanding the Building Regs easier.
They try to explain the ways in which to comply.
But apparently, as they aren't 'The Law', we should ignore these.
When things in those documents clearly contradict what the actual legislation says, then yes. As John has pointed out several times in other threads, if anything ever got to court, the court is supposed to look only at what the legislation actually says and means
as written, not try to "make it fit" what it thinks the politicians and civil servants intended it to mean, or what it thinks it should say.
Leaving aside NICEIC, NAPIT etc. guidance, it doesn't take too long to realize that the officially issued guidance in the approved document for Part P contains things which contradict what the actual regulations say.
Look at table 1, which is supposedly a summary of the various exempt works as set out by schedule 4. It mentions the exemption for replacing a damaged cable for a single circuit, and even gives specific examples of how it might come to be damaged. But it also links to a footnote:
Replacing the cable for a single circuit only, where damaged, for example by fire, rodent, or impact. (a)
(a) On the condition that the replacement cable has the same current-carrying capacity and follows the same route.
Can you find where that condition is imposed by schedule 4? I certainly can't. The applicable part of schedule 4 says simply:
1. Work consisting of—
(b) replacing a damaged cable for a single circuit only;
There's nothing about the same current-carrying capacity or the same route in there.
Continuing down the table, it adds a footnote to the exemptions for adding socket outlets and lights:
(f) Only if the existing circuit protective device is suitable and provides protection for the modified circuit, and other relevant safety provisions are satisfactory.
Can you find where that condition is imposed by schedule 4?
There is plenty more, but you get the idea.
I'm just glad I don't have to worry about it.
Neither do those of us who just operate on the "Carry On Regardless" principle.