Hi Greg,
Thanks for the response. I’ve followed your advice and it does look like a plugin conflict with IvyCat AJAX Testimonials version 1.5.1. With either plugin disabled the site comes back to life.
It was working before, so I’ll try rolling back IvyCat and see if that helps. I’ll go and post on their page as well so that they are aware of the clash.
Do you still want the error logs if I can obtain them?