They think they're electing a pope,' says one leading architecture school head. He is speaking of Cambridge University's search for a new professor when Peter Carolin goes, probably at the end of the next academic year. Who might consider themselves to be pappabile - despite there being no declared vacancy? Evergreen favourites like Ivor Richards, Roger Stonehouse and Richard Frewer fulfil the criteria of being Cambridge graduates and existing heads of school. Of a younger generation, and a different gender (shock!), is Helen Mallinson, head at North London. But Astragal's hot tips are people who like building as well as thinking - Eric Parry and Richard MacCormac, as long as the latter thinks it won't scupper his chances of eventually becoming president of the Royal Academy.