Hi, I am fitting an external floodlight and understand that it would make sense to add an RCBO to the lighting circuit that this runs off - is this a notifiable event? I already have a mix of MCBs and RCBOs - with the RCBOs protecting my two socket circuits. I am wondering if it would be better to fit a 100A RCB and shuffle the MCBs along, to take a busbar coming out of the RCD? The biggest practical issue that I can see with that is that all of the RCDs that I have found have the live on their LHS and the neutral on the RHS. This would make the busbar pass immediately under the neutral outlet, with potentially disastrous consequences. First - am I talking total b*ll*cks? Would I even be permitted to do this myself? And are there any RCDs that have the live on the RHS? I realise that the answer to the first question may make the others irrelevant, but I'd like to make things better if I can - and I can't afford to replace the entire CU.