Looked elsewhere and found a solution without using a Snippet call.
Put this in the header;
.....
<script type="text/javascript" src="scripts/swfobject.js"></script>
<script type="text/javascript">
var flashvars = {};
var params = {};
var attributes = {};
swfobject.embedSWF("homepage.swf", "flashcontent",
"660", "374", "7.0.0", "expressInstall.swf", flashvars, params, attributes);
</script>
.......
And this where the slideshow should display
.......
<div id="flashcontent">
<a href="
http://www.adobe.com/go/getflashplayer">
<img src="
http://www.adobe.com/images/shared/download_buttons/get_flash_player.gif" alt="Get Adobe Flash player" />
</a>
Opps, you seem to be missing Flash - please install via the link above. </div>
..........
and all good !