Lectrician
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What size cables are using?
If you used 2.5mm cable(and the existing was 2.5mm or larger), and linked the two fused spurs together, as long as the MCB was swapped to a 20amp, you would be fine. Obviously RCD protection is required (not just MCB).
Bathrooms are also a notifiable location, and you should not be carrying out work there without notifying building control before you start, or paying a self certifying electrician.
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