Thanks for looking at the graphs and interpreting them for me. Re the NTE5 faceplate I am aware that I should not fiddle with it but it's in my house and I'm competent when it comes to wiring so I would hopefully not cause myself any problems if I were to try moving it and I understand that on my head be it.
I have nothing in my house that comes on at the time the problems really start to kick in, but they do occur when daylight is starting to fade and if I were just looking at the graphs I would say it must be some sort of lighting but as I said there are no such lights in my area. The heating is not currently on in my house and we have nothing that comes on over night. Outside the house there are two lights which operate on PIR's but I can and have isolated them. I have a CCTV system which switches to IR overnight but I have tried with this turned off and it made no difference.
I have tuned a radio to 612khz after 10pm and I get very good reception of a foreign language radio station.
