Yup, that's it!
Haven't seen that since 1979 as no photos of the PG ever capture it. And speaking of the "tight space", I beleive this is one of the things that give QE2 her historic charm.
I remember landing on Q Deck by mistake after taking the C Stairway lift to the top thinking I was going to 1 Deck. I wonder how many others found themselves there by mistake on Q Deck with the lift doors opening and not knowing which way to go. As I remember and as depicted in your photo, there is no fast way to orient yourself once there.