The Hiroshima legacy, 75 years on; and how lockdown's made it harder to catch terrorists.

What is the legacy of the Hiroshima and Nagasaki nuclear bomb attacks? 75 years on, survivors have contributed to an oral history of that's being exhibited at the Imperial War Museum, with a message that governments must to do more to ban nuclear weapons. We speak to nuclear strategy expert Sophie McCormack, who tells us how modern missiles are much more powerful today, and explains what could happen if one fell on London. 

Also, Scotland Yard's counter-terrorism chief has told our home affairs editor Martin Bentham how lockdown has made it harder to catch terrorists in London. Commander Richard Smith says confinement's meant people at threat of being radicalised aren't being spotted by those who could notice the change. He also reveals they're investigating 800 leads into possible plots. 

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