thanks Ray... thats rewriting the url to include the path right the way to the server root...
so if you add http://www.domain.co.uk/affiliates/reservations.php gets rewritten to http://www.domain.co.uk/home/domainid/public_html/enquiries-booking-form.php/reservation.php
and if you just do http://www.domain.co.uk/affiliates/ it gets rewritten to http://www.domain.co.uk/enquiries-booking-form.php/ with the trailing slash....