J. K Rowling - Harry Potter Series
Ian Fleming - James Bond series
George Orwell - Animal Farm
Arthur Conan Doyle -
Sherlock Holmes seriesRonald Dahl - Charlie and the Chocolate Factory
C.S Lewis - Chronicles of Narnia series
These are a few I can think of off the top of my head. I think Sherlock Holmes would be the most interesting and useful as I love them myself and all take place somewhere in England (mostly in London itself). Though this would be taking place in the late 1800's rather than modern days.
Edit: How could I forget J.R.R Tolkien - Lord of the Rings series.