Mark Elliott has an interest in pop that’s bordering on the obsessive. Including a complete run of Madonna and Pet Shop boys releases, he’s amassed a huge collection of 15,000 records and almost as much music memorabilia. When he wasn’t out buying more, you’d find him publishing magazines such as Time Out, Empire and The Face, and, in more recent times, writing books. The next one’s on Stock Aitken Waterman. Inevitably.