As Des 56 says it can be a useful if your "downstairs" lighting protection device should trip you are not entirely left in the dark and vise versa. As been mentioned I'd just put a note next to the consumer board.
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Discuss Help - Had some work done in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
only if Land N were fed from different circuits.Always a contentious point due to the stairs/landing light(s) being switched from ground floor and first floor (2way).
Reply to Help - Had some work done in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net