Insulation resistance (Line/Neutral) under 2MΩ for circuit Cooker DB1 one 2MΩ is normally considered as a pass, and two what is wanted is if reading is with isolator off or on, one would hope isolator off, which would mean there would be a second comment as to cooker, which I have not seen.
I would agree it would take time to do the ring final fault, and can see why FI for that.
No additional protection for all circuits by a 30 mA RCD (not applicable if designed pre BS 7671) (701.411.3.3) seems a little odd, BS 7671 is 1992 so why not say 1992, and 701.411.3.3 is for locations containing a bath or shower, and the relaxing of the bonding in the bathroom so think that came in 2008, it was not 16th edition as numbering changed so it would seem likely unless bathroom has been refurbished since 2008 that does not apply. So we have a date of 1989 so there was neither BS 7671 or 701.411.3.3 in 1989.
I think there should be RCD protection, my last house and this house have had it installed, there was 471-16-01 A socket-outlet rated at 32 A or less which may reasonably be expected to supply portable equipment for use outdoors shall be provided with supplementary protection to reduce the risk associated with direct contact by means of a residual current device having the characteristics specified in Regulation 412-06-02 it became 411.3.3 and has been used to fail many an EICR, but again 2001 that came in.
It is the same old question does it become potentially dangerous? And if not required at time of design is it required now, and with 701.411.3.3 the answer is yes, as before then everything was earth bonded, so the basic point is either earth bonded or RCD, if neither then yes potentially dangerous.
However does it really matter is RCD is required or not? It is not something the tenant can add themselves so should be fitted by landlord, same with SPD the tenant can’t fit it himself and to protect both the landlords and tenants equipment it should be fitted, although clearly not part of an EICR to say it should be fitted.