(ever heard the term 'Russian Trawlers')
My first UAS Summer Camp was at Binbrook in 1967, home in those days to 5(AC) Squadron, flying Lightning F6s. We were allowed to sit in on the daily Station Briefings and I remember that the locations of the 'Russian Trawlers' were pointed out - one in the North Sea and one in the Irish Sea.
I also remember that when we flew cross-country and talked to RAF ATC en-route, we used the appropriate tri-graph callsign prefix and had to identify our aircraft type as "Single Piston". I bet that fooled the Russians bobbing about in their trawlers!
