Thanks for the pointer - will try that next time. :)
"you can edit the tinymce config to accept any html eg iframes.. See http://doc.silverstripe.com/doku.php?id=tinymce&s=tiny%20mce#forcing_tinymce_to_eat_other_code"
The link you supplied is broken, any chance of getting a new link.
We would also like to do the simple task of embedding a video within content.