REMOVE

1. Garden squares -- England -- …
2. Greenhouses

WHAT

1. Architecture -- England - … (3)
2. City squares -- England - … (3)
3. Public art -- England -- … (3)

WHERE

1. ENGLAND, UK (3)
2. Sheffield, South Yorkshir … (3)

WHO

1. BURO HAPPOLD (2)
2. PRINGLE RICHARDS SHARRATT … (2)
3. FULLARD, George (1)

WHEN

1. 1957 (1)