I see what's eben wrong, a silly oversight. I'd forgotten to add the full url to the embed code!
Here's the new html (which works):
PHP Code:
<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://fpdownload.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=8,0,0,0" width="670" height="70">
<param name="movie" value="http://www.superfancy.co.uk/shop/images/banners/limelites.co.uk-flash-banner.swf" />
<param name="quality" value="high" />
<param name="allowScriptAccess" value="always" />
<param name="wmode" value="transparent">
<embed src="http://www.superfancy.co.uk/shop/images/banners/limelites.co.uk-flash-banner.swf"
quality="high"
type="application/x-shockwave-flash"
WMODE="transparent"
width="670"
height="70"
pluginspage="http://www.macromedia.com/go/getflashplayer"
allowScriptAccess="always" />
</object>