Blitz builds a garden for a good Samaritan who paid a very high price for his act of kindness. With the help of our friend 2GB giant Ray Hadley, Blitz surprises a local hero live on air, and builds him a stunning garden. David McArdle, a truck courier, became front page news and an instant hero earlier this year when he was horribly injured while assisting a woman who had a car accident on the M4.