I was intrigued by the formation Saphos used on 3/6/21's Welsh Marshes Whistler. From videos on youtube the consist appears to have been BSK (support), FO, BSO, FO (mk2 aircon), then FO, FO, FO, RB, FO, CK, all mk1, generator. So are Saphos down-grading a FO aircon for use as standard? And are...