Great idea for a challenge Clive. I've never been a fan of photographers who hide their intentions by looking the other way/tilting their screens whilst shooting people without their knowledge. (A) people are not silly and can tell exactly what you are doing, and (B) it's infringing on their privacy IMHO. When I shoot street scenes, I always speak to the person after I shoot the photo, or at the very least stand in plain site to let them know of my basic intentions. It gives subjects the chance to say 'Hey I don't want to be photographed', in which case I will gladly erase the photo. As a man, shooting people up close without their knowledge is a sure way to risk getting arrested for being a pervert..........