Hi. Indeed the issue is what is notifiable work. Looking at what is written, notifiable work seems to be in cases where there is a provision of a new CU or a new circuit. It seems the regulators are really concerned about being informed about changes to electrical installations. So, if all you are doing is disconnecting a circuit in a CU, then simply reconnecting, that is perhaps not notifiable. A situation where you might want to disconnect from the CU then reconnect, is if you need to have the cables moved from one side of a joist to the other.