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Really good advice @rive_gauche , I snuck a 10mm armoured destined for the garage in our extension foundations yesterday before the concrete oversite gets laid today. Your professional approach made me check the regs on burying and I didn't dig the trench deep enough or use tape so back out with the spade. I panic bodged.
Nothing wrong with that approach as with two metered connections (1 public, 1 private I assume) and two isolators (and protective devices I assume) a fault condition in one CU shouldn't take out the other supply.
Also adds a degree of future flexibility as iirc you're rebuilding the property and may at some point wish to move the house CU.