Google adwords conversion tracking code - not working :-(

I have added some google adwords code to a thank you page here

http://www.firstcommunionportraits.co.uk/thank/

Using a chrome plugin (tag assistant by google) I am able to see that google sees the code but the plugin reports it as non standard. I haven't changed anything just cut and pasted it!

I used the html tab to cut and paste the code from adwords and I'm worried that wordpress might have reformatted it?

What is the best way to add adwords conversion tracking code? Do I need to use a plugin?

Here is the code I added but it is NOT being verified by my adwords account.

<!-- Google Code for FirstCommunion Conversion Page -->
<script type="text/javascript">
/* <![CDATA[ */
var google_conversion_id = 978638497;
var google_conversion_language = "en";
var google_conversion_format = "2";
var google_conversion_color = "ffffff";
var google_conversion_label = "9Pc7CPeo8AgQoa3T0gM";
var google_conversion_value = 1.000000;
var google_remarketing_only = false;
/* ]]> */
</script>
<script type="text/javascript" src="//www.googleadservices.com/pagead/conversion.js">
</script>
<noscript>
<div style="display:inline;">
<img height="1" width="1" style="border-style:none;" alt="" src="//www.googleadservices.com/pagead/conversion/978638497/?value=1.000000&label=9Pc7CPeo8AgQoa3T0gM&guid=ON&script=0"/>
</div>
</noscript>