....or the cpc hasn't been terminated in a terminal which is pretty common especially on pre 17th edition as no testing was necessary and the cpc was just an earth and treated as unimportant in a switch. And the cover needs to come off the ceiling rose as a BC doesn't give an earth and nore does an ES usually, more than one light fitting per switch and you don't know if that has continuity without removing the cover.
My point was it just depends on what quality of work you do and IF you take signing your name to the report seriously or not.
If it's an EICR or periodic then you have NO idea what the guy was like who installed it or who has done what since.
Me I'm just a Part P'er so wouldn't presume to tell a proper sparks what to do but the guy who took my Part P course was great, (it was one of the first ones), one of the best courses I've ever been on and it reinforced a lot of things I'd done over the years and I found the reasons behind some things I'd read but not fully understood.
One thing I do have is respect for that thing we deal with as our job, it just loves to get out of that wire and get to earth, our job to make sure it doesn't but if/when it does then it gets there damn quick and blows the fuse!