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Thanks for all your help, everyone. I went to the effort of drawing how it looked in terms of the wiring to help make everyone understand further but I guess reading all the latest comments I didn’t perhaps needed to. Excuse the poor drawing!

@ SUNRAY - Sorry i'm not understanding what you mean? Would it help if i told you how things were wired before the new 13A FCU was installed...is that what you mean?

@pete01 - I just switched off the new installed 13A FCU which is spurred from a kitchen socket. When I turn this off, the FCU next to it (Boiler 3A) switches off as well as anything else in the shed – lights, saniflo etc.

@ SUNRAY - for the blue part, do you mean how the shed cable was wired inside the 13A fcu?

@pete01 - The supply came from one of the kitchen sockets into the 13A fcu. What left from that 13A fcu is two cables, one going to the shed, and the other going into another 3A fcu (boiler one)….obviously that supplies the boiler.

@ SUNRAY - thanks for your advice. As the supply is coming from one of the kitchen sockets, to do it your way would have required chasing and ripping out units etc…which is perhaps why it was done the way my diagram showed. This is why I posted to see if it’s done correctly or not…because...

@securespark - I checked the white flex wire going into the shed…could barely read it but it says g 1.5mm 300/500 V. That should be ok for 13A right?

@Murdochcat - what way would you have done this?

@Murdochcat - as long as its allowed?

@securespark - do you mean that white cable going to the shed? its quite thick. I need to check the rating of the wire.

@pete01 - The shed only has a toilet, saniflo (which requires electic), one light and extractor fan. As mentioned before, the builder initially took the supply directly from the 3A Boiler FCU…but when saniflo was added, perhaps saniflo requires more electric so perhaps why he installed 13A FCU...

@pete01 - The first FCU (13A new installed one which is spurred from a kitchen socket), if you switch this off, then the shed supply gets cut off and the boiler FCU (3A one) turns off also.

@Murdochcat - Perhaps my diagram didn’t explain properly. Existing layout: A wire 2.5mm is spurred from one of the kitchen sockets (in a ring) to an FCU used by the boiler (3A). So, if you turn of that FCU then yes, the boiler will turn off. But in the new way laid out, I believe the...

@Murdochcat - One online video states that if you add an FCU then you could connect many sockets after that. Is FCU not another socket?

@pete01 - Could you elaborate what you mean by 'maybe the boiler fcu is off the load side of the new fcu'? From what I recall, initially no new FCU was installed so perhaps the feed to the shed was taken directly from the existing boiler 3A FCU, but then few days later I saw next to the boiler...

Hi I recently had a shed/room built next to my bathroom for extra toilet etc. The builder wired the electrics as shown in the picture. I just wanted someone’s opinion on this if this is done correctly as I see 2 FCU installed in the existing bathroom instead of one.