text: It's definitely BAGNALL not Bahnall. The area is known as Bagnall too. At its western most end it starts in Milton, on the east side of the crossroad, but I'm not sure where it's name changes as to my recollection there are no street name signs to indicate such. But at the point you mark it's Bagnall Road. 
  For added info the two bus stops marked on the map near here labelled "Hospital" is a reference to a hospital that used to be where the Bagnall Heights complex is now.