English Heritage adds 14 post-war office buildings to its protected lists

"It's one of the more daring buildings in the City, one of the more assertive," says Roger Bowdler. With his jacket and Likely Lads grin, he looks like an architect from the 1970s. Which is appropriate, because we're standing, looking up at 30 Cannon Street. Built as an outpost of French bank Credit Lyonnais in 1977, it was the first building in Britain to use glass-reinforced cement.

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