Yes, but "not being required" is surely not the major issue. If you are replacing the board, then the logical thing would be to include RCD protection for these buried cables (and most/all other things) - so I imagine that you would only fail to provide such protection if you felt that there was some positive reason for omitting it?
If loss of light would be a danger, then that surely can only be addressed by installing emergency lighting? - lighting can be lost because of power cuts and faults that trip OPDs etc. as well as from RCDs operating.
.. and as I've just written, if it is judged that loss of lighting might represent a danger, then by far the most important thing would be to install emergency lighting - 'RCD trips' are by no means the only possible cause of failure of lighting!
Yes, but installing an RCD would increase the risk.
You talk as if I might about work in my own house
Only by a miniscule amount (i.e. if the emergency light, as well as the primary lighting power, failed at the same time). If one has installed emergency lighting which will come on whenever the lighting circuit loses its power (for any reason) then, provided that emergency lighting works, installing an RCD will not result in any increased risk.
Maybe I need a trip to Specsavers, but I've seen nothing in the current regs which suggests that the requirement does not apply to all installations.
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