Was asked to move, add a few socket's in a kitchen before Christmas.
The guy had just purchased it, when I came to cooker cable it looked like it was 10-16mm?
Was really flexible, so stripped it back , and it was pure alloy as was rest of house.
Done a few I/R tests Zs tests , and basically passed , but was unsure.
Done a bit of research, and as was said previously used in 70's for only a few years in domestic property's, due to copper shortage.
Apparently a fire risk because cable oxidises when exposed to air in a domestic fitting, and can cause high resistance/ heat /fire.
Used in other application's other than domestic, but with waterproof/grease filled terminals to avoid air ingress.(i read this)
Guy next door said his insurance was void, unless he re-wired,as he had done years earlier.
Also building inspector came out to pass off an RSJ we had fitted,and advised the guy to re-wire it also!
Bottom line, the owner read a bit on net, and asked me to rewire total house, so result !-
If you look up on net it basically says fire risk , so your client might do well to have a look themselves .
Might get a nice job.