Four pictures were passed to The Cattery and I've attached them, below. They are not best quality photography and I suspect that they were taken with a mobile telephone.
However they may be of interest to those who have never seen the basement of a telephone exchange . . .
Image-1 shows the massed ranks of E-side cables passing through the gas & water seal between the basement and the "cable pit".
Image-2 appears to show some jointing work in progress on an E-side cable. Note the faults-man's telephone hanging at the right hand side.
Image-3 appears to show a 1200 pair E-side cable where it is transformed into six 200 pair cables, the six cables then ascending (I presume) to the MDF, above.
Image-4 appears to show a closer view of a paper insulated E-side cable, opened up for jointing work.