XF 1.4 Embedding forum in an external site

Previously I have been able to embed XenForo using an IFRAME statement e.g. www.DuntonGreen.info
<iframe name="main" src="http://www.sevenoaksforum.com/forums/dunton-green.25/" height="2200" width="100%" frameborder="0" scrolling="auto"></iframe>
but have recently updated to 1.4. and noticed no longer working. Chrome gives a blank page and IE shows
This content cannot be displayed in a frame

Looking through the forums found references to clickjacking and config.php .. tried adding
$config['enableClickjackingProtection'] = 'false';
but still no joy.
Any ideas?