Just a little correction/exception to the leisure Gatwick business LHR model. That is Bermuda which while a sunny sandy island only reallye xists as a daily direct because of business. It is an extremely affluent place whose main source of income is international fiancial services especially insurance.
the execs and specialists in this industry travel A LOT all over the world and the BA 2232 and 2233 are frequently full in F and J while pretty empty down the back. Also being an extremely expensive place to holiday quite few people who do go there on hols will pay a premium.
Most of the premium pax on this route would like to go to LHR , and that was once the case but with the phasing out of the lovely Tristars and their replacement by the less lovely DC10 the route wnet to LGW because thats where the 10s were based. At varios times the flight went on beyond BDA to Nassau, Jamaica, Tampa where there was ample opportunity to fill up the Y cabin
I do wonder why it hasnt moved to LHR which has 777s as does Gatwick but I am guessing that in BAs mind the upheaval of moving and losing a LHR slot just outweighs Pax preferences. So its not quite a simple leisure /Business split