I have enjoyed reading the banter thread re ASCOT, sorry I am not a shiny aircrew type but I can claim to be one of the guys on the other end of your H/F SSB link, and served at various Flight Watch locations during my 37 years such as Upavon/Gibraltar/Cyprus/Gan and Singer,s, where the ASCOT c/s became very much part of my working life.
Sadly I can still recall many of the SELCAL codes including some VC10 (EGAL and EGAK) Hercs (AHJM AKDL etc) and many is the time I have fiddled with the SELCAL buttons whilst realigning the LogP aerial to secure a ''SELCAL watch'' with an a/c.
Prior to SSB of course it was all wiggly amps and Samuel Morse, ears straining through crackling atmospherics trying to pick out the dits and dahs, and R/T messages that often faded into oblivion (QSB)
One of the best a/c c/s I found to send in morse was the Flight Checker IRIS, it really flowed off the key...will stop waffling now and return to my cubby hole