This distressing documentary looks back at the terrorist attacks of 7 July 2005 through the eyes of victims and first responders. Two decades on, they remain visibly traumatised

There was a lovely mood in London on the evening of 6 July 2005: like the heady fizz of a midsummer glass of champagne. The sun was out and the news was good. Earlier that day, the city had been announced as host of the 2012 Olympic Games. The streets and bars were buzzing. Martine Wright was among the people out celebrating. Accordingly, on the morning of 7 July, she was mildly hungover and making her way to work slightly later than usual.

She jumped on to a Circle Line train and remembers being surprised and delighted to get a seat. And then everything changed for ever. She has very few memories of the minutes and hours that followed the initial blast although she was, apparently, conscious for most of it. She seems to have blanked it out. She can only speculate: “Maybe my brain just decided I couldn’t take any more?”