last scheduled BOAC? Comet 4B on finals for LHR
Sorry, details for this are at home and I'm not !
BOAC had Comet 4 only, last of these ran in about 1965 from Africa, most sold off to Dan-Air afterwards.
BEA had the Comet 4B (shorter range) which lasted until about 1969. But when they were replaced by Trident 2s they were moved to Gatwick for the new BEA Airtours charter operation. It was not unknown for them to come back to Heathrow on "charter" to BEA mainline operations when they were short, so the last schedule with a BEA Comet would be more dificult to trace. Most of these aircraft went on to Dan-Air or Channel Airways.
One BOAC Comet 4 did stay at Heathrow as an engineering trainer for years afterwards. The recently published book on BOAC history has it in the background of the cover photograph of the first BOAC 747, which arrived in 1970, and you might have thought it was not possible to get a photograph of these two types together in BOAC livery.