Yes, every final circuit requires its own method of isolation.
As per the regs:
BS7671:2008 - 314.4 said:
Where an installation comprises of more than one final circuit, each circuit shall be connected to a separate way in a distribution board. The wiring of each final circuit shall be electrically separate from that of every other final circuit, so as to prevent the indirect energizing of a final circuit intended to be isolated
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