Help---using pdfs with PHP

This is the code I use if ($HTTP_ACCEPT_LANGUAGE=="en-gb") { header("location: URL/test.pdf"); exit; } but it doesn't work, whereas when I paste the URL into the browser, it works fine. Is there any reason for this? Thanks Sam Rose ____________________________________________________________________________ ________________________________________________________________ The information in this email and in any attachments is confidential and may be privileged. If you are not the intended recipient, please destroy this message, delete any copies held on your systems and notify the sender immediately. You should not retain, copy or use this email for any purpose, nor disclose all or any part of its content to any other person.