Originally Posted by
Discorde
This diagram shows controlled airspace over southern England in the mid-1950s.
Interesting diagram – It shows what appears to be a ‘Blue 1’ in Sector 7.
By the 70’s (if not earlier), Blue 1 began from Eagle Island VOR off the west coast of Ireland, then on to Dublin, Wallasey, Ottringham, reporting points Dogger and Bluebell, then on into Dutch airspace at 'SPY' (not going to spell out this one!) and then onwards and eastwards.