My father was a Ferranti man through and through and was involved in Silverknowes from joining in the early 60s. He was offered and took early retirement in the 90s when BAE bought what was by then GEC Marconi. His last years were as MD of the INS and EO divisions. Although he's retired now, I suspect would be able to give you warts and all - PM me if you want me to put you in touch. Being the old spotter that he is, I am sure he would be fascinated to relive his youth.