'Safe' and 'legal' are essentially the same thing, since all that the law (Part P of the Building Regs - which is just one sentence) essentially requires is that it should be safe. Even your present setup probably qualifies as safe, particularly given that you have some provisions for emergency lighting. If you made the changes we've been discussing, it would be even better.
I'm not totally sure what you mean by that. Your present setup, in which a fault on a lighting circuit could take out the entire installation, would probably not be regarded as regs-compliant if it were installed today, but with the lighting CU RCD-protected, it probably would be (obviously only considering the one aspect we've been discussing - there could be other problems we don't know about).
And today's regulations are the only ones against which it could be certified today.
Exactly- which is why I said that I wasn't sure what he meant by 'certified'. It either did or did not receive an EIC at the time it was installed, and it couldn't get one now, even if it were compliant with current regs.
that even if the electrician did feel that he could certify his new work to BS 7671:2008 he did not act in a manner consistent with a professional trusted adviser in leaving the RCD arrangements as they were.
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