What was I expecting, I wondered, as I looked at every man who passed? If I were to go by cliché, he would have been a seedy-looking middle-aged man in a cheap suit, slipping off his wedding ring as he turned the corner. In fact, I was pleasantly surprised. Dave, who works for an events company, was 30 and wearing a casual jacket, black shirt, jeans and trainers, looked unthreatening and certainly didn't have a psychopathic glint in his eye. He had attractive blue eyes and seemed nervous.