WHBM
Unfortunately the Trident never operated out of Gatwick.
Actually it did, albeit on rare occasions.
Although as far as I’m aware there was never a permanent Trident base at LGW, it was not unknown for an aircraft and crew to be based temporarily at LGW, to cover aircraft shortages or unserviceability there.
Twice in the 1980's I did just that, being based at a LGW hotel for a week, and operating to FRA and DUS.
Regards
Trident Sim