You can listen to this talk on the CYMFed site here.
Barry and Margaret are always impressive and always deeply moving whenever they speak. Since the tragic loss of their son Jimmy in 2008 to a violent attack in London, they have done a huge amount of work to stop violence among young people and to spread their story - a large part of which includes the faith which has sustained them over the years.
I remember their talk at Hyde Park a few years back. It was amazing. Their talk at Flame was pretty good too. Go watch it...
You can read more about their work here.