The last time I was at Kew, I think the upstairs balcony of this particular conservatory was closed, so I was too delighted to get to go up the spiral staircase and see the ceiling structures up close.
As someone who got an A in truss design, I was too thrilled to look at this ceiling. As an added bonus, this was one of the temperate conservatories, so it wasn't as hot as other structures, and so I didn't fear collapsing from heat stress.
