I've been asked to attend a few haflas, my mobile studio in tow, to do 15 minute shoots with attendees for a small fee. However, I'm not sure how much to charge. Currently I charge £45 an hour for a shoot - however I'm unsure whether people would pay £15 for a 15 minute shoot with me. So ... what I'm getting at ... is if I turned up at your Haffla what would you be willing to pay to have a 15 minute shoot? The outcome would be a disc of your hi-res and optimized for web photos as well as a £5 voucher off a full hours shoot with me.