Going back a bit before 9020 was really working there was a thingee that I seem to remember called Hermes which produced strips for us in the Tower at LHR. I assume that it must have been a fallout from the original Linesman/Mediator, I know it was LATCC based, more I cannot remember.
No Bex not 42, but 120, Wing QFI St.Mawgan,CC Cat board, 37 then finally QFI at Kinloss. Either email me or ask HD if you cannot work it out.