7/7 attacks: 'It will always be difficult to talk about'

Tim Coulson was travelling eastbound on the Circle Line train when a suicide bomber blew up the passing westbound train.

He wasn't injured in the explosion but broke out of his carriage to help people on the other train who were.

Now every year at the memorial service he reads out the names of all those who died in the 7/7 attacks on London.

This is his story of what happened that day and the following 10 years of healing.