Wales does not have requirement for an EICR for single occupancy dwelling, they said there is enough homeless as there is, don't want to make it worse.
The EICR has been a problem for years, it is the inspectors personal view rather than a fixed you must have, clearly a exposed live part is a code 1, but potentially dangerous code 2, well all 230 volt electric is potentially dangerous.
The code 4 which said did not comply with current edition was removed, code C3 does not need fixing in a hurry, so only code C1 and C2 is of real concern. Also F1 which means the tester was refused access. Could be as simple as no loft lid, or a locked door, but also there is nothing to stop the owner stipulating what he wants including, so he could say for example non including the garage.
So every edition of wiring regulations I have read gives the date of design when it comes into force, so an installation designed in 2000 even if not completed until 2002 still comes under BS 7671:1992 amendment 2 or 3 not BS 7671:2001. However things have moved on in 20 years, so a electric car charging point could mean the installations is potentially dangerous, it is up to the inspector to decide, and it is not easy, as the charge points have moved on so one installed in 2018 could fail but one installed in 2020 could pass.
The problem is so much has changed it is hard to keep up, even the inspectors are not sure how to tell if a "6mA DC vehicle fault protection" or not so he can be excused for failing some thing with a type A RCD instead of type B RCD even when it only requires a type A.
I don't think you have an electric car, so your not worried about that, but wanted to point out how the inspector can't hide behind the regulations, if could be safe when it does not comply or dangerous when it does, he is not saying it complies or does not comply, he is saying if safe or not, that's not the same.
So even if a single RCD for all does not comply, it still fails safe, so is safe.