I too spent 9 happy years on the Trident mainly Threes and don't recognise some of the adverse comments made. As conveyed so well by Steve, the problems of lack of thrust were of BEA's making - but entering a descent after boost engine shutdown - absolute tosh. As for its flying qualities they were superb - and I've seen it up to the high subsonics, with no signs of mach buffet or need for artificial devices. By contrast, the Tristar required the terrifying Recovery Speed Brake and the DC10 hit a wall above M.85 needing bank angle limitation to obviate buffet during cruise.
How good to see Pete and Steve going strong though Pete barely recognisable without pipe.