I recently asked several of the Tor UK authors, including Jay Kristoff, Paul Cornell, Neal Asher, Cherie Priest, and more, to offer one tip for aspiring writers. The advice that came in was just what we hoped, quick and highly useful. (And often about criticism of one's work, surprisingly enough.) Check it out:
John Gwynne: Write for yourself. Something that you want to read. More than that; that you’re desperate to read. Then hopefully some of that passion will leak onto the page.