From "About the Author" in Superior Beings:

Nick Walters lives in Totterdown, Bristol - location of the steepest street in Europe, fact fans.  (Curiously, it's called Vale Street...)  Thankfully for cyclist Nick, he doesn't live on this street, though he has walked up and down it in wonder a few times.  Superior Beings is his third Doctor Who book for the BBC.  He has also written a New Adventure for Virgin (with Paul Leonard), plus many short stories, a few of which have found their way into various compilations.