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My house has got two CUs. One with an RCD and one without (fuse wire FTW). Would you be able to live in that?
Depends which circuit I get zapped by.
Seriously, RCDs change touching a live wire from being a reasonable-chance-of-death event to being a reasonable-chance-of-having-to-reset-the-clock-on-the-coffee-machine event. It's like if cycle h*****s actually did what their mouthiest proponents said they do.
My house has got two CUs. One with an RCD and one without (fuse wire FTW). Would you be able to live in that?
(I'll get the old CU changed one day but I want to get the probably asbestos panels in the ceiling of the garage where it is replaced first and that requires emptying the garage which means finding homes for all the things in the garage which at least in part means sorting out the shed which means deciding if we want a shed or a garden room etc... - meanwhile the new CU with the RCD protects the more risky areas (kitchen) so I'll live with it).
Answering @bobble, you aren't buying a new build with everything up to current spec and guaranteed. Old wiring in old houses is to be expected.