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The bottom board has an RCD so only talking about top board, so implication is if there is leakage on for example the cooker after changing the RCD may trip, but as is unlikely to be a problem. The main reason to go from fuse to trip is should a fuse rupture looking for a new one, should a trip go it is a simple reset.
As to danger of not having RCD well it seems unlikely there would be any where the circuits are not to sockets, unless you drill the walls a lot, so on balance for some one retired who one assumes is not going to be drilling walls, it could be safer without the RCD, or more to point trips.
I say this as looking at lights, when a bulb blows there is a fuse inside the bulb which should if the gases inside the bulb ionise blow, and with 99% of time blow before the fuse in fuse box/consumer unit, but with a trip they act faster, so instead of fuse built into bulb failing the main trip goes so you loose all lights.
So doing a risk assessment I am not convinced moving to RCD protection is the right thing in your case.
As to danger of not having RCD well it seems unlikely there would be any where the circuits are not to sockets, unless you drill the walls a lot, so on balance for some one retired who one assumes is not going to be drilling walls, it could be safer without the RCD, or more to point trips.
I say this as looking at lights, when a bulb blows there is a fuse inside the bulb which should if the gases inside the bulb ionise blow, and with 99% of time blow before the fuse in fuse box/consumer unit, but with a trip they act faster, so instead of fuse built into bulb failing the main trip goes so you loose all lights.
So doing a risk assessment I am not convinced moving to RCD protection is the right thing in your case.
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