ISP without PHP, can I get around this?

Hi all New to PHP and have read through the installation instructions - the problem I have is that the ISP of work`s choice, Demon Internet does not support PHP. Is it possible to put PHP in a /modules/ directory in my own webspace or does it have to be installed in the directories as per the instructions? Also I don`t have anything near root access on the server in question, only standard limited telnet and FTP to the webspace we rent from Demon. Any thoughts? Thanks -Bridge Project Worker and IT Officer Centre for Sustainable Energy, Bristol T: 0117 930 4097 x227 F: 0117 929 9114