I like the MK▸ I in the opening footage of the prototype HST▸ at 0.08
Whilst the Second Class had Blue seats, as the MK III only had one basic body shell, not all the Second class seats lined up with the windows.
Correct some comprimises were made in second class seat alignment, but most seats still had a view and it was obvious some effort at alignemnt had ben made. Unlike modern trains were seats are bunged in with complete disregard for window alignment.