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In the last few weeks. The previous CU was fitted in 1997. Agreed. We are getting the whole house checked by an inspector to make sure that the CU and circuits are given a certificate.

Yes, The guy obviously was just trying to get the system running and couldn't bother to do a good job. In fairness, though, the system has worked for 8 years without needing any maintenance and this has only come to light because of the new CU and me being proactive in trying to fix the issue...

I will get a better joint box and set the layout correctly. I removed the borrow neutral from the circuit and as I thought, the lights stopped working in the bathroom only - the other lights in the Upstairs circuit stayed on. I am now wondering why that guy didn't use the neutral from the rest...

When I say, "shaver", I think that it was a toothbrush charger. Well, here is a picture of the offending article. Why would anyone use a borrowed neutral in a regular lighting circuit? i guess that I can disconnect it and see what happens to the lights. I am guessing that they will go out?

Well... I think that I have an answer to where the problem is, as I have found that it is a shared neutral from the mains to a shaver socket in the bathroom. When I plugged a light into the mains and had everything upstairs switched off/disconnected, I had an open circuit. I then got someone to...

Thanks for the help. I guess that I am inclined to agree with you. I am sad, however, that no one wants to even suggest any way of finding out what the issue is.

Steptoe, Thanks for the input, however, the electrician that installed the new CU is not touching the old wiring, as he did not install it. Can I have some advice on how to find the issue? Where do I look to try and fix this?  Everything is working as expected, but there is the weird...

Thanks for your help, Dave. However, I am where I am and that guy is long-gone now. Oh well. If I turn on the ring main only, only items on the ring main come on. No lights come on. If I turn on the lights only, all of the lights work. I am guessing, from that experiment, that it is a...

Dear All, I am trying to fix up our house after an electrician replaced our aging CU (with no RCDs) with a new-fangled double-RCD CU. This was done because we had a new extension and so we needed to separate out the old circuits (on RCD A) from the new (on RCD B). The circuits on RCD B are all...