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Where will you be putting the JB, Will it be MF, why use 10mm2 flexible cable, never seen double insulated cable, seen cable that is insulated with a PVC outer sheath though.I will check my earthing type but I think it's either TNS or TNCS.
Regarding the 10mm cable it runs through my loft space and where it connected to the original shower isolator it will be now going into a junction box and connecting to a black round double insulated 10mm 3 core cable that runs to the workshop.
As my workshop is only 3.4M the black 10mm will be dropped through my soffit and clipped to the house wall for approx 1.5M's before it goes into the workshop.