Well I read "extension to his kitchen" as meaning an extension to the kitchen to make it a bigger kitchen, not an extension built on to the kitchen that was used for some other purpose.
I still think the best approach is for martin123 to just do the work to BS7671, test the new circuits, write an EIC, and say nothing. If challenged he should say that he already had building regs approval. The guys at LABC just want a quiet life, and once they see that he's qualified/experienced, and the electrics are fine I'm sure they'll let it go. But that's just my opinion based on no experience or expert knowledge....
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edited to correct spelling error
I still think the best approach is for martin123 to just do the work to BS7671, test the new circuits, write an EIC, and say nothing. If challenged he should say that he already had building regs approval. The guys at LABC just want a quiet life, and once they see that he's qualified/experienced, and the electrics are fine I'm sure they'll let it go. But that's just my opinion based on no experience or expert knowledge....
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edited to correct spelling error