Ah well, there's the big question ...Can I please clarify something - do I have to bring my installation up to date with the latest regulations when having an EICR? For example, say in 10 years time there was a new Edition and I had an EICR done then - would I have to bring everything up to the new Edition?
Or, providing that the installation is safe, can it remain at 18th Edition standards?
Assuming no faults (such as broken fittings etc) then the regs are not retrospective and the EICR would merely list items as "C3 - improvement recommended" and the overall result as "Satisfactory". Some things, such as lack of RCD on sockets likely to be used outside, might merit a C2 - potentially dangerous but not needing immediate upgrade.
I'm also a landlord, and so my reasoning goes along the lines of: if there's a "defect" listed on the EICR, could an unscrupulous tenant try and take advantage of it ? The answer in many cases is yes, and a few years ago I upgraded the CUs in my properties to all-RCBO (they previously had no RCD at all, built in mid 90s). IME, adding RCD where there's none is a no-brainer if you care about your tenants' safety.
However, now those are not completely to standard - the CUs have plastic cases. For one property the guidance is that it should not even be mentioned, for the other it should be a C3 as it's in the open-plan lounge and a fire (or smoke) from the CU would impact on the escape route from upstairs. At some point I'll probably consider replacing the latter - but I then have to decide whether to do it myself (and pay LABC handsomely to notify it), or tolerate paying someone else for whatever their work standards are and let them notify for peanuts via their scheme What I've saved not replacing the former goes towards the £300 I've just shelled out for new/extra linked smoke/heat/CO alarms in that property.