anyone been in one or seen that 4-3 seating.
Yes. In early 1971 I was an ATCO Cadet at the Field Training Unit at Stansted and I and my fellow-students were shown around one. It felt incredibly claustrophobic and, despite being young and (relatively) slim in those days, I just could not get into the seats partly because of their narrowness but mainly because of the incredibly small seat pitch.
NB