Despite its comparative modernity, PB was indeed well provided with single-needle morse telegraphy equipment Micky.Micky wrote: " .... A railway friend of mine that i use to know in the late 1960s & early 1970s who was once a telegraph lad at WGC (1962-63) and was also a tele-lad at Potters Bar as well told me that this box had s/n telegraph instruments (maybe 2?) but rather then them being of a 1880s/90s G.N.R. wooden type they were of a 'modern design' obviously to fit in with the modern decor although when i visited the box in 1973 i can't recall seeing any s/n telegraph instruments??. .... "
The lad's desk which was near the right-hand 'wing' part of the main panel, and at right-angles (so the lad faced south), had an S/N concentrator with needle units for about four circuits [and the usual set of 'telephone'-type keys (switches) for circuit selection], and one 'sender' unit, which stood on rubber feet and was connected to the rest by quite a long cable, presumably so it could be moved simply, to be in easy reach of the 'sit-down' signalman on Nights (when there was no 'Lad' rostered).
The S/N equipment was non-standard though : In a 'nod' to look suited to fit into it's 1950s-style surroundings, all the needle units had white faces behind the needles instead of the usual mid-dark green, and the wooden-cased sender unit had a completely semi-circular shaped top.
Quite possibly by '73, as the S/N system had been gradually falling out of use from about 1970 (mainly I think with the influx of signalmen borrowed from 'oop north' to alleviate a chronic shortage of London-area signalman to keep enough of the boxes manned, without training them up on 'the needle'), the telegraph equipment was perhaps removed along with the original panel.
@PinzaC55