I got a reply from the hosting company due to the site just being a white page now:
“It seems http://www.warden.co.uk/new was redirecting to http://warden.co.uk which did not resolve and would never work, so we have amended DNS for you so that it does resolve. Instead of erroring, it now returns a blank page.
It seems that http://www.warden.co.uk/new/index.php is setting a cookie and supplying header details, and sending two carriage returns in the body, but that is all (hence the blank page).
Looking at the code in http://www.warden.co.uk/new/index.php, it does not look like the array is being built which the code subsequently tries to reference.”