REMOVE

1. Building materials
2. Sheffield, South Yorkshire

WHAT

1. Architecture -- England … (11)
2. Architecture -- 1800-1900 (7)
3. Architecture -- 2000-2100 (6)
4. Buildings -- Change of us … (6)

WHERE

1. ENGLAND, UK (11)

WHO

1. PROJECT ORANGE (6)
2. not known (6)
3. BURO HAPPOLD (4)
4. PRINGLE RICHARDS SHARRATT … (4)
5. TORY, Frank Snr. (1)

WHEN

1. 2012 (6)
2. 2002 (4)
3. 1885 (1)