As you may know, the Holburne has revised it's extension plans. The extension is still of glass and ceramic, but the height and colour has been changed, a new top floor window added, and the staircase moved to provide a clear route through the whole building from front to back. Details are here: http://www.bath.ac.uk/holburne/future/modified-scheme.html
The new plans will go to the council committee vote on November 28th.