The upper boxes were a new addition when the theatre was transformed by Delfont Mackintosh in 2003.
The Prince of Wales now has exceptionally good sight-lines, though I would readily agree that the boxes for this show offer the worst viewing experience. If any other seats in the stalls and circle are available I would personally choose them first.
How fascinating - and really appreciated the photo links - brought back memories.
I knew the follow spots were about in that location, but never really thought if they were just a platform or more solid. I guess they looked more solid to me than they were and I forgot they were accessed by ladder.
How things move on.