Right found it and almost wished that I hadn't lol
[11-May-2012 11:44:54] Warning: include(/include/check_useraccount.php) [<a href='function.include'>function.include</a>]: failed to open stream: No such file or directory in /home/sites/genpoweruk.co.uk/public_html/modules/One_Page_Checkout/func.php on line 194
Was one of those but theres nothing popping out at me with regards to my "bottom"