There was a near miss with an Indian Air Force Connie over Heathrow about that time.
But the only Northolt gasholder incident I can recall was when Pan Am mistook it for the LHR one.
Ron Gosse was the supervisor at LHR the next morning to hear his desk man question Pan Am's first flight of the day; "Good Morning Clipper. And where would the world's most experienced airline like to land this morning?"