very interesting link, mate,Nice pictures NobodyGirl, and welcome to the forum. Good to see its not been sealed up, which can't be said for other buildings in Derby.
I remember when the staircase was still intact two years ago (and most entrances in were wide open) I wish I had the guts to climb the stairs back then because I bet it was amazing.
Doing some research into the building I came across this planning application on Derby City Council's website LINK
it is too nice a building to be demolished for some ticky tacky rubbish to replace it,
hope something usefull will be made out of it to preserve the exterior look of the place, which i really like.
interesting to hear from someone who visited the place when that spiral cast iron staircase was intact!
bet it was a bit of a gamble to go up it, even a couple of years ago tho!