On the Anniversary of the Battle of the Somme, this Somme Extra looks at some of the background to 1st July 1916, we take a walk from outside Albert to La Boisselle and Mash Valley, visiting Ovillers Military Cemetery. The podcast includes a recording of Liverpool Pal Ted Williams, made in the 1980s, and our object this week is a group photograph connected to the story of 1st July 1916.