Sitting in Humanities 2 at the British Library, wrestling with a pile of Radiotimes bound volumes in the interests of research, a programme billing from April 1979 leapt out at me. "8.10pm - Accident. A drama series in eight episodes. In the confusion of a road accident ten lives are mixed in a jig-saw of past and present." If you ever wondered what Anthony Horowitz was watching on Wednesday nights 30 years ago, now you know.