The Israeli security wall is going to be some 700 miles long when completed and will surround most of the West Bank. Seen by some as a cynical land grab and others as an apartheid barrier, opinions on it are hugely divided. But who are the people who live in the shadow of this wall and how does it affect their lives? Mark Thomas decides to combine his two great loves, walking and talking, and travel the length of the wall in an attempt to understand a bit more about the conflict and its effect on everyday people.