Bit anorak I know but there is a thread over at TankNet that has some VERY detailed specifics about what was seen (or what they let us see), when and how.
Even details about East German reports on how many times we broke the rules.
What was the classification of Ivan aircraft that departed from thier planned route to fly over Fylingdales etc ? I seem to recall X-Ray's being one level below Hostile but time may have clouded my memory....