Thanks for that. Seems to confirm my (limited) recollections
I’ve got an old photograph of self boarding Britannia G-APLL at the old LHR North side from about July 60. For the life of me I can’t recall the destination.
The only other candidate was a Comet 4 flight from Rome – LHR which I believe was about a year earlier. (Father worked for BOAC hence the travel).