I understand that open Mk1s had facing seats in both 1st and 2nd class, both for coaching stock and long-distance MUs. I guess the earliest Mk2s too? But how is it in the more recent stuff? I think Mk4s from some photos I've seen have a mix of airline-style and facing seats? But how about Mk3s and later Mk2s? And for that matter HSTs, 442s, 156s, 158s?