I must apologize as I was not quite awake it seems, when making my last post. Did not see the 'https' connection to Google links. Usually an 'https' connection to an off-site URL is another way of avoiding SSL security msgs.

I do believe the problem is with this:

<script type="text/javascript" src="https://checkout.google.com/seller/accept/j-en_GB.js">

Although there is an 'https' connection it is used for a 'javascript' file which is not using an 'https' connection for what it is doing.

Hard to say though, if your Google links are the problem without being able to see your page code.