When I joined NATS (well Board of Trade to be precise) I was a Radio Technician and I worked on the Marconi Myriad Flight Plan Processing System* at West Drayton. It did electronic flight strips for the military. Now 40 years later almost to the day I am working on EFD for Prestwick and Swanwick.
Have I spent the last 40 years in a time warp?
Anyway I'm out of here in 26 days so good luck to EFD :-)
*
Sad techy fact, the whole system ran on three parallel running 24Kbyte computers 