Complete list of worldwide sites here,
http://www.faa.gov/education_researc...st_centers.pdf
You'll have to copy and paste, cos I don't know how to set up link.
UK is Farnborough £150 per exam or Norwich £175 per exam, maybe plus vat too.
Plus
http://www.sportys.com/faatest/
is a free questionbank, once you have registered