If I still had my J.J.C. log book, it would show 5th December 1965. on a VC-10 to JNB. We called at CIA + NBO (disembarking only at the latter. If memory serves, the former was not origincally scheduled for our route but not a diversion.)
I was nine years old and stepping out onto the tarmac at NBO, and into the African night, at about 02:00 local - was a sound that I have not forgotten. My big sister (14) said to our parents that the sound was, "Just like the soundtrack of Daktari"!!!
There were a number of other times through EGLL in the next years (living in South Africa and then studying in Bristol) until 1979, when I moved to London and EGLL became my local field. Although I have lived near LTN, there is only one field I call 'home'.