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On September 5 1975, the workers and guests of the London Hilton Park Lane arrived at the hotel, thinking that it would be just another day.

But by 12.20pm, the hotel had been rocked by a horrific tragedy, leaving two families devastated and dozens scarred for life.

The Irish Republican Army (IRA) set off a bomb at the hotel, which blasted through the reception at 12.18pm, which was packed with workers and visitors.

A warning call had been placed to the Daily Mail by the IRA around ten minutes earlier, and the message was passed to the Metropolitan Police.

But by the time they managed to scramble to the luxury hotel opposite Hyde Park, the bomb had been set off with

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