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Steven Desborough was in his twenties when he was on the London Underground commuting to work on the morning of July 7 2005 when four suicide bombers killed 52 people and injured more than 770.

Mr Desborough told 5 live's Lesley Ashmall: "There was a huge white flash which filled up the train".

"I just remember seeing a lot in black and white as lights were being shone in your face".

London Underground staff escorted commuters off Steven's carriage "As we started to walk up the tunnel we started to see debris, walking up the tunnel you wouldn't realise it was a tube train. I stepped out of the line [of commuters] and shouted [into a carriage] I was a first aider".

"I tried to do my best for them".