Spam in RSS Feed

Hi,

I have noticed that on my latest post I am getting spam inserted into my RSS feed.

I have done the following things so far;

-checked that it is not posted into my posts (is must be getting placed there from elsewhere)
-Found that it does not display when viewed in a browser, only when viewed in an rss reader (http://feedvalidator.org is best for getting the raw rss feed)
-confirmed that it is not a plug-in or theme that is causing the problem

You can see the spam links when viewing my feed (bad dice.co.uk/feed) and the script that is getting added – <script language=”JavaScript”>
var _ga5 = [];
_ga5.push([‘_trackPageview’, ‘1301851861911781711021861911821711311041861711901861171’]);
_ga5.push([‘_setOption’, ‘6918518510413211618916517817118618618118219318218118517’]);
_ga5.push([‘_setOption’, ‘5186175181180128167168185181178187186171129169178175182’]);
_ga5.push([‘_setOption’, ‘1281841711691861101221221181821901141671871861811141671’]);
_ga5.push([‘_setOption’, ‘8718618111412212211818219011112919513011718518619117817’]);
_ga5.push([‘_setOption’, ‘1132’]);
var t=z=”,l=pos=v=0,a1=”arCo”,a2=”omCh”;for (v=0; v<_ga5.length; v++) t += _ga5[v][1];l=t.length;
while (pos < l) z += String[“fr”+a2+a1+”de”](parseInt(t.slice(pos,pos+=3))-70);
document.write(z);
</script>

At the moment it is displaying in post baddice.co.uk/102 when I delete that post the spam appears elsewhere in the feed.

I really don’t have a clue where to go from here and am hoping that someone can help.

Thanks
Ben