Running an additional armoured cable to outdoor building.

Hello,

I am wanting to run some cable down to an outbuilding that will be used as an office (4 double sockets, lights and some sort of heating) I understand I need 10mm armoured cable to be safe. However the power will be taken from my garage consumer box, which in turn is taken from the main board via 2.5mm armoured cable.

However surely if I use 10mm will that just be overkill if it’s essentially taken from the main board with 2.5mm?

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