I received a private message asking for help, so rather than replying to that I thought I'd post the question here so other can benefit as well
Hi David,

I was wondering if you could help me. I have installed your Google ReCaptcha mod and changed the look to 'Clean' and stuck it in a Div to centre it and it all works very well, what I am trying to do though is add this same code to 'Ask a Question' mod by Scott Wilson www.thatsoftwareguy.com

I can get it to look look exactly the same as on the other pages, however whether I enter the ReCaptcha code or not the form gets submitted. I don't get the message telling me I haven't filled this part of the form in. Any help you could give would be greatly appreciated.

Thank you for a great mod.
I think the questioner is using v1.39h.

If you look at the ReadMe instructions for pre 1.51 versions. In section 4A are the changes for /includes/modules/pages/contact_us/header_php.php
You need to apply those same changes to /includes/modules/pages/ask_a_question/header_php.php (the line numbers will be different, look around line 41)

Hope this helps
Regards