The fickle gasholder is not there now. It was at South Harrow and as I remember it had a large NO painted on it.
The incident with the Connie happened shortly after I moved to harrow and I remember the local paper reporting that it had disappeared off the radar in the shadow of Harrow Hill. After Northholt turned the plane they told Heathrow what they had done using a field telephone. I believe the enquiry suggested that communication between the airfields could be improved