ACW, later certainly. At first however we had 3 routes and the one into Newcastle used Ouston Bombplot. There was no bomb plot at Walney Island which would have been a bit too close for Amber 1. Are you sure you didn't mean Luce Bay and West Freugh?
I can still remember the phone number:
'Stranraer 2501'
to which the reply was '76'
followed by the patter of the intended attack profile.
More frequently however after '76' we got "This is Stranraer 2502"
I don't know how many times the operator put me through to this old dear. She always sounded surprised and NEVER ever was she angry.