I think Chris meant to say that the last British Airways Trident service was in nineteen EIGHTY-five. I'm afraid I don't have any info on Chinese services. A small number of BA aircraft were sold in Africa (Zaire), but these didn't operate for long as far as I know.
I'm sorry to say I only flew on one Trident (G-AVFM, LHR-AMS in April 1977). This was my first jet flight. I remember being impressed by the climb angle after take-off, but this was only relative as my earlier flights were on Viscounts and Heralds. As stated before on this forum, the Trident was nicknamed "Gripper" due to its apparent reluctance to leave the ground. And with 3 Rolls Royce Spey engines, they must have been about 50% noisier than a BAC 1.11.