Just to show that I am not (1) asleep (2) ignoring this thread
I'll say that I am in total agreement with
Walter's advice.
For those who decide to review this entire thread, they will see that
HPsauce noticed, quite a few posts back, that there were
two extension cables connected into the master socket . . . something that was staring
b*cat in the face but which he completely miss-observed.
Ideally, that jointed "mix and match" cable run all the way from the
A- and
B-wire terminals of the
NTE5/A to the incoming
service cable (either underground or overhead drop-wire) would be replaced with one contiguous length of CW1308 specification cable and the venerable
GPO 700 series terminal block replaced by a
BT80B-RF3.