In the condolence book David Cameron wrote:
This was a deeply shameful event in British history, one that Winston Churchill rightly described at the time as 'monstrous'.
We must never forget what happened here, and in remembering we must ensure that the United Kingdom stands up for the right of peaceful protest around the world.
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The judge said the 14-year-old had been subject to a great injustice. He was executed for the murder of two little girls in 1944.