A few weeks back, I was hard at work on Murder by the Mile when a friend dropped by for a visit. While he was here, he kept staring at my kitchen table where I had piled source material and research. I figured he was interested in the book. We were talking about other things, though, and I never explained about the papers and books.
After he left, I went into the kitchen and realised what he was staring at: an open wedding album displaying the wedding announcements of several different couples. I needed an example to write one for the book; I wasn't stalking newlywed brides.