MetalMonkey
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How far does this regulation go back?
This regulation came into force in 2015 IIRC, so it has been in play for a while.
If you are talking about 411.3.3.
Before that the regulation still existed in the 17th but with slightly different wording (sockets not exceeding 20A) and exemptions.
However, as mentioned other regulations can also require the use of RCDs in various scenarios which may or may not be applicable depending on the installation.