I am trying to trace a phone line here at work and stumbled upon this diagram, whilst checking out the wiring. The bit on the right was the part that caught my eye, particularly “The quality of wiring carried out by many older BT wiremen is often approaching art in its perfection”
Here’s our krone for the phones – all installed by BT I should point out:
High art as you can see. Perhaps he was having an off day..