i just was looking at it from an inspectors point of view and not the installer, as if this was the case the inspector wouldn't look for the fault, just report the readings after checking correct meter operation.
I forgot to add your scenario could be valid for a company if they so wished..
But you mustn't confuse company procedures with BS7671 guidance or good practice:-
Consider three hypothetical small businesses each with 5 employees..
all concentrating on domestic wiring
Company A do site work with a build contractor, they always work on larger site where 40+ houses are being built at a time..
Each man has a key task
employee 1: First fix just carries cable & back boxes etc..
employee 2: Second fix just carries socket, switches fittings etc..
employee 3: Dead tester just does Continuity & IR tests
employee 4: Live tester just does Earth loop, PFC, RCD etc..
employee 5: team leader: bit of everything manage and help out others if slip behind schedule signs off certificates..
Company B do social housing with a council in a 40 mile radius of the city, they work in teams of two.
employee 1: Installer First & second fix.. (team 1)
employee 2: Tester dead & Live tests.. (team 1)
employee 3 & 4: team 2 same roles as team 1..
employee 5: team leader: programs job into diary by geography & manages materials to ensure at site when teams arrive to do their work etc..
Company C provide alteration and maintenance for private customers on a one-off callout basis
employee 1: All aspects of work Install / test / Certify / Fault find etc.. has large fully stocked van full of kit to cover most common call outs & alterations.
employee 2, 3, & 4 same roles as 1..
employee 5: team leader: answers customer phone calls, books employees to jobs, organises emergency materials or assists if double handed work needed and no other employees local.
They will all have different company procedure about how they progress or delegate fault investigation work..
BUT..
whoever does it will need to follow basic ground rules for investigating the problem in a safe way
whilst verifying which components of the installation are working and which components are faulty.
Excluding essential health and safety guidance and procedures
C&Gs are not interested in various company procedures that are just down to the structure of a company.
Guinness