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@Zebra_Cyclist
Hardwired is where there is a thin fuse wire which burns out if there is to much current going through the cable i.e. someone is getting electricuted. MCB's Mini circuit Breakers trip if the same thing happens and have a switch on them so you can easily reset them. On top of this all new fuse boxes (which maybe a reason to change your fuse box) have RCD's Residual Current Devices which work on the difference between the feed and return current these are connected to banks of MCB's and are the ones that make the whole house go dark when they go.
Yes a sparky can certy someone elses work