@ parkfell
PK atc took over from NATS on 1/4/1993. Stu Mimmack was their first GM - Tim took over in 1994. Re Cygnet 66 , you are correct = JM & yes, Barton Hall closed in 1975. I was on a night shift in 1974 when the high level sector was transferred to West Drayton - I still have the Bluebell designator strip from the D Side, gifted to me by the Watch Manager :-)