As of Amendment 3 to the 17th edition of wiring regulations, metal consumer units have been a requirement in ‘NEW INSTALLATIONS.’ In actuality, this rule went into effect on 1st January 2016 for new consumer unit installations. We hearing from landlords that they are having electrical safety tests completed and failing because they do not have an up-to-date ‘new metal consumer unit’ or ’18th edition consumer unit.’
To be honest, each electrician has to use their own engineering judgement to produce an EICR.
There are guides to EICR Coding, however these cannot account for all situations as risks vary depending on the context. This is where a skilled and competent electrician will rely on their experience and intuition.