MKB Form Installation Help

We have installed MKB forms on a site we launched yesterday: http://www.speechwrite.com

The recaptcha challenge displays OK, however the form is able to be submitted regardless of whether or not it is filled in correctly (removing disabled from the button to allow it to be submitted).

The documentation says the <perch:input type="hidden" id="g-recaptcha-response" class="g-recaptcha-response"> Should be filled in when a successful recaptcha is entered but it is not. Oddly the form submissions get through anyway even though this field remains empty on submit.

Has anyone else experienced a similar issue and maybe have a pointer to help resolve?

Try another angle, has anyone got this working on a runway site I could view?

Even a live demo to prove it can be done would help me a little.

Interestingly, If I remove the secret key it errors out, however if I enter anything in there whatsoever for example: 'XX' it works but all responses go into spam.

So it is checking for the correct secret key, but not verifying the recaptcha response? Lets anything through.