You won't be able to get a 3 core 10mm T+E though.

Can I ask if your an electrician?. Because as I mentioned in post #14 you may find the 4mm CPC is good enough, but you need to do the adiabatic equation to make sure
 
3 core and earth? You would just need the 10mm T+E and then a separate 10mm earth. Basically just ensure that the size of the earth is always at 10mm for the whole run. If that makes sense
 

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New garden office, Cable selection and method...?
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