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On 7 July 2005, a British teacher, Tim Coulson, took the London Underground to work - a seemingly ordinary journey, yet one which was to change his life forever.

That was the morning when suicide bombers set off explosions on the crowded London transport system which killed 52 people and injured more than 700.

The underground train that Tim was travelling on was in a tunnel near Edgware Road station, and was passing another train carrying the bomber Mohammed Siddique Khan when he exploded his device.

As the trains were plunged into darkness there was panic everywhere.

But instead of looking after himself, Tim risked his own life to help the people who were dying or injured in the huge explosion.

He still suffers from the traumatic aftereffects of the terrible sights he saw, and has had to give up his job as a consequence.

But he has been given awards for his bravery, and there are some who call him "the angel of Edgware Road".

Now, more than five years after the bombings, an inquest is being held into the events of 7 July 2005.

Tim has been there giving evidence, along with workers from the emergency services, other survivors, and the relatives of the dead.

Tim Coulson came into the Outlook studio and told Matthew Bannister all about the events of that fateful day.