Getting back to the original question, undoubtedly the Trident. By the way SSK, only the 2E variant had a few rear facing seats as they were originally 'owned' by BKS and/or Channel Airways; as far as I know all original BEA ones were configured with forward facing seats.
It was faster and smoother than any other airliner of its day and we had great fun on our ATCO Cadet course when we went to Viking House and 'flew' the systems trainers.