Your form is not validated. I didnt enter any details in the contact form, clicked on submit, it went straight to the thank you page.
Click the following link:
http://www.vodahost.com/vodatalk/forms.html
This will help you to learn more about using php coding to validate the form. Other than that, the site looks really great!
Feel free to ask if you require any help.
Regards
Teri