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Rep
Original wiring done by a guy in the 70's who took the place from a derelict farm cottage into a vision of the 1970s, dark wood layered in varnish, sauna, single glazed conservatory that somehow is colder than outside temps in winter etc. He did most of the wiring over years. Current consumer unit fitted in 2016 by a local 'electrician'. Looks tidy on the surface of it. I think he would have done some tests, looked at the hell scape that was behind the thing and decided to do a consumer unit replacement only then scarper (wise!).
BrickMan-
Tbf you shouldn’t really replace a consumer unit if the fixed wiring is fucked. Because when you sign off the consumer unit, you’re signing off the wiring too.
Best one I heard recently, house was sold with new consumer unit fitted. But they’d just mounted a new board and hadn’t connected any of it!
Nef
It’s just wild that any old dick head can go and buy a consumer unit from screwfix and install it.
There are plenty good sparks out there, but there’s also very little to stop anyone having a go.
Don’t get me started on the minefield that is electrical qualifications.