‘In the past, Sheffield has been a bit demolition-happy’

Why we should value our 20th-century architecture

Dear readers — Ten years ago, Castle Market closed its doors for the final time. “This multilevel market, with its collection of individual stalls, shops and stands, was unlike anything else in the city, or anywhere else,” Owen Hatherley wrote of it in the same year. “A 1960s dreamworld, a cornucopia, a maze of surprises, delights and, occasionally, sho…