You are talking regs now. The reality is that the single cable will supply double insulated data equipment in a cupboard. The socket will be plastic. The equipment will be on 24/7. It is not a power ring with high current metal kettles & heaters open to people touching the metal surfaces and the likes. That is where people's safety is then paramount. It will be fine for a few years until update. Risk of electrocution on this circuit is very, very low. A new 32A ring would need the RCD for sure.I have seen many older CUs provided with an external RCD. Perhsps there is one. We cannot guess.
What has 6amp to do with anything? It doesn’t matter if the new circuit only provides power for one tiny lamp at the top of a Christmas tree, if the wiring is concealed, or has a socket then an RCD will be required.
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