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> if you notice that that is too high, you will still have to run around with a power consumption monitor to identify the individual culprits

Or just the good old method of turning things off individually, one at a time.

I’d think panel support would logically have a probe per circuit, so you could get the complete breakdown if and when necessary.

Though obviously it’s still only on per-circuit basis, and if an idiot wired your house that may be less useful than the platonic ideal of house wiring.

Leviton offers what you describe:

https://www.leviton.com/en/products/residential/load-centers

There's an energy monitor with 16 CT clamps included, you put one on each of the circuits coming from the fuse board. 16 is more than enough for most UK houses, which would at least let you know which circuits are consuming the power.