You really need to invest in a BGB - since otherwise you could end up giving out incorrect information all over the place120.4In common sense terms, I obviously agree with you, but some (particualarly 'inspectors') may well feel that it is not the place of individuals to use 'thinking, knowledge and experience' to 'over-ride' the strict word of the regulations to which they are meant to be working.
I presume you mean 133,5 - which, in any event, relates to 'new materials and inventions', not 'thinking, knowledge and experience' and requires the resultant deviation to be noted on an EICR.
Kind Regards, John