Certainly Trident 2E - checking my fathers log books - always a 2 from in his case from Feb 1970 through to Oct 1974. Flight time around 3:20 outbound and 3:40 return - there and back in a day as the logistics of crew hotels etc were horrendous. I recall that the routing was tightly prescribed to ensure they were kept away from certain installations. Certainly one of the longer flights but the Tridents 2's used to do Tel Aviv non stop with an outbound leg of around 4:30 and return legs up to 5:05. Interestingly when he switched to TriStars the Tel Aviv flights were always 15 - 20 minutes longer as not much could keep up with the Trident certainly before they were restricted to M0.8 in Oct 1973.