First of all thank you for this great plugin!
I have a problem with the redirect. After submitting I get the error:
Warning: Invalid argument supplied for foreach() in /home/photo123/public_html/jillyblog/wp-content/plugins/si-contact-form/si-contact-form.php on line 474
I checked the redirect box and entered http://www.123photographs.co.uk/thank-you/ in the url box.
I then tried the default url (ie index.php). No difference.
I then unchecked the redirect. No difference.
I tried changing the theme by reverting back to the default, twenty ten - no change.
I tried deactivating all other plugins - no change.