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If you dont like it, run the lighting cables in metal conduit and SWA or MICC. Its the simple answer to a robust lighting circuit.RCDs for any non-protected cable buried less than 50mm, thus meaning pretty much all circuits including lighting? A bridge too far.
More than one way to skin a rabbit.
Of course, there are always methods, but I was thinking more of existing (relatively recent) installations where the lighting is already in T+E and it's just a CU upgrade.
Is split-concentric allowable for non-RCD buried cables?