swa cable to shed

[JohnW2]

i just know that there is a circuit breaker named "outbuildings" in the cu, and have tested it for power when i switch it on. ... all i know is that the swa cable goes into the back of the cu as there are no extra boxes around the cu, or on the outside wall, so i assume the swa cable is terminated in the cu somehow.

OK, fair enough. In that case, I would say that PBoD is essentially correct. If it goes all the way to the CU, one that existing SWA is removed there will be absolutely nothing of the circuit left (just the, then unused, breaker) - so anything new that was connected to that breaker would probably count as a 'new circuit', and therefore need notification.

There quite probably would be 'ways around' that (involving breaking the existing SWA), but you probably would not be interested in knowing about that!

Kind Regards, John