Hey guys - thanks for this thread.
In the end, I didn't use the wordpress.org/extend/plugins/embed-iframe
I used the text editor.
One issue, scroll bars appeared, but I got ride of them by writing scrolling="no"
So my end embeded code was this.
<iframe src="http://URL HERE" scrolling="no" width="840" height="550"></iframe>
Hope that s helpful and thanks for your help.