A Canberra from Farnborough used to travel to Culdrose several days a week in the '80s for torpedo dropping trials (Stingray?). Can't remember which one but it was probably the B6 as I remember one of the Air Observer boffins (Mavis) telling me how on one occasion the pilot (Harry Martin) reported no visual contact with the target, but she (sitting in the nav seat in the rear compartment and facing backwards) twisted round and looked out the front and she COULD see the target!!