Funnily enough, I haven't. The newer Sys X and Sys Y Exchanges were being installed when I was first taken on with BT. I worked as a 'Sparky' for my first few years, so when I eventually moved to the dark-side, dial-phones were a thing of the past.
Did you get to attend any pow-pows at the Adelphi, Liverpool? There were regular training seminars held at the Hotel on Sys X/Y installation for GEC/Marconi/Plessey engineers. Legendary shindigs, so say the few who survived them!
Ha ha, I can well imagine the 'wrap party' when comms engineers are involved.
I have been to The Adelphi for a couple of 'Meet & Greets'. The main one was when Openreach was on the threshold of being fully launched. I was 'acting up' for my boss at the time and was sat amongst the upper tiers of management. The ones that kind of write their own pay-checks. I actually got to say 'Hi' to our then CEO (Steve Robertson), and felt like a teenager meeting their pop-idol for the first time !! I was by no means infatuated with the guy, he just had a presence about him if you know what I mean
Anyhows, after the presentations and lunch, it was off to Albert Docks to unveil the new Openreach van liveries and the engineering communities workwear. Our original outfits were actually purple, and we looked like a team of pimps !! It didn't last long before we reverted back to blue.
For those who aren't aware, the Sys X and Sys Y Exchanges saw the demise of Strowger, Crossbar and the two TXE types (TXE2 and TXE4). The floor space created once the old stuff was removed was immense !! That was a lot of my job at the time, de-commissioning large/medium bus-bars and other 240/415V electrical gear. I know I hark on about BT now and again, but it
really was a pleasure coming to work back then !!!