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what a mess! 60 amp incoming with 63A mcb's, white fuse holders on the line conductor, 400v everywhere, contactors feeding conductors, cables like bow strings, sockets without RCD's, all this before you leave the supply cupboard , what is the rest of the house like?, but on the bright-side they...

the 12th edition was the 1950's and the tester would have been a ELCB would it not? not a RCD testser

Has it not always been the case that the electrical regs are not retrospective, I know when I was doing my time (14th ed) this was the case ,what did you do in your days as a qualifying supervisor, was it not the same? (or did you work for the NICEIC as a supervisor) even some jobs done to...

the regs are not retrospective, if you did a consumer unit change , would you rip out all the Red & Black Twin & earth? but any alterations will need to comply with BS7671 2023, if you are doing an EICR then that also has to be carried out to BS7671 2023, it does not matter what edition was in...

as above

true

the regs are not retrospective, but on a EICR any departers from the current BS7671 2023, can be noted as a C3

it should before any tee and within 600mm of where the water pipe enters the property, if its a metallic pipe

this is a good start and maybe do some weekends

can we have a photo of both your meters setup and both consumer units

it does not matter if its 3,4,or5 wires as long as its wired correctly as per the instructions,

the outside brown and red look like they go to the lamp the yellow is the touch wire and inside brown and blue look like the feed in to the switch, so more likely the bule and red should go together, just fit a new 4 wire one and follow the instructions that come with it, and don't worry about...

below could be an answer

you need to swap over the grey nylon gland from the consumer unit with the brass one in the isolator for the T+E, then buy a 20mm piranha lock nut for the consumer unit in the house for the SWA and run a fly lead the the earthing terminal, this will save you drilling a hole in the board for a...

did the light you took down work before you removed it?

I think they used to sale them in the sweet shop, along with shoe laces and Spanish gold bags you can drill through joists, but only in the correct place, and the correct size hole, depending on the size of the joist ( you will need to read up on this, to many variables to list here) , better...

NO,

sometimes they don't like to do that, as they would want access to the meter box when the tenant is away from home, and read the meter when they want,

yes if you want , I have done it like that before, but used an 80A switch-fuse (metal clad ) and used a 3core SWA to help with the earth-loop

looks like you don't have any room for shadows , two should be ok , one 400mm in from each end , it depends on the colour of the room and if there are any reflective surfaces,