As someone else said, in the UK, sockets are generally wired in a ring -
and have a pair of cables supplying them so to isolate the socket you
need to disconnect both cables.
Have a look at the wiki for starters :
It's important as was suggested, that you understand the basics of this
before working on the system. and understand other arrangements of
socket wiring you might come across.
Why were you cutting the cable? What are you wanting to achieve? If you
are cutting the cable to remove a socket you need to remake the ring.
Sockets are usually wired on a ring circuit. See the illustration here:
Cut one side of the ring, and there is still an alternative path via the
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