This is what shows:
BPS SECURITY / HTTP ERROR LOG ============================== ============================== >>>>>>>>>>> 403 GET or Other Request Error Logged - 13/07/2013 - 10:43 PM <<<<<<<<<<< REMOTE_ADDR: 86.135.47.200 Host Name: host86-135-47-200.range86-135.btcentralplus.com SERVER_PROTOCOL: HTTP/1.1 HTTP_CLIENT_IP: HTTP_FORWARDED: HTTP_X_FORWARDED_FOR: HTTP_X_CLUSTER_CLIENT_IP: REQUEST_METHOD: GET HTTP_REFERER: REQUEST_URI: /wp-content/plugins/riva-slider-pro/timthumb.php?src=http://www.shaunhillphotography.co.uk/wp-content/plugins/riva-slider-pro/styles/skins/default/shadow.bak&h=0&w=960&zc=1 QUERY_STRING: HTTP_USER_AGENT: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.72 Safari/537.36
I have amended the custom code as you have instructed.