Funnily enough Mr Trident until the mid 60's I lived in a house approx 200 yds away from the location you pinpoint on the map. As an adolescent I used to take an interest in the aircraft movements at Heathrow but can only ever recall one occasion when a BOAC Britannia flew almost directly over my house whilst heading for the airport.
On the other hand when aircraft were taking off in an Easterly direction, presumably from 09L, a high proportion did pass almost directly overhead as they climbed out - me and friends often used to sit in our garden with cheap binoculars noting the registrations off the undersides of the wings.