Ok, I am guessing it was a temporary error as it does not seem to be happening today.
Ebay had changed us to the new listing style yesterday, so I am guessing it was something to do with that.
Thanks for the help. I will stick the HTML snippet in before the style sheet anyway, just in case it happens again. Shame I didn't get to find out if it solved the problem for me though
Mike @ NRG IT Ltd