Had to add this email from David:
"Bill's just given himself a fright. Went off for his 10 minute walk and seems to have gone along Brookwood and then up either the street by the Shah house, or up Roy Malony, went along a cross street, thought, "About time to head home," and then found himself on upper Highfields Tce. Disorientated, he asked a lady for directions. The first I knew anything was amiss, aside from thinking, "That's a long ten minutes", was when a huge 4x4 pulled into the driveway. I thought it was Marcia but it was the nice lady from number 13 dropping your Dad off!"