Lived n Bermuda in the 80s and some quick crossings from there . One does stick very much in my mind as around 5 hrs 10 mins Kindley Field to LHR. Cannot remember date but BA BDA Ops transfered to Gatwick in later 80s so probably around 85.
This was on a Tristar possibly a -500.
Of course as it was due to a very strong jet Stream the return a few days later was a very very long journey of about 9 hours 30 passing over Iceland -close to Southern tip of Greenland and then down Nova Scotia and onwards to BDA. A very graphic example of the impact the Jetstream can have