It is an embed, Mark. The code is :
<iframe width="500" height="300" scrolling="no" frameborder="no" src="https://www.google.com/fusiontables/embedviz?q=select+col3+from+1FeKHeJC3zmNRKIpnwzGhY5bAO372rFFXq8dL7pnX&viz=MAP&h=false&lat=54.925868720004516&lng=-1.9801368187499975&t=1&z=5&l=col3&y=2&tmplt=2&hml=GEOCODABLE"></iframe>
I've got it into a Wiki page, where it works fine. When I tried to put it in a post, I pressed the button for code view, and pasted it in underneath the code for the message. When I went out of code view, I could see the map woring well in the post. But when I pressed Send, the code was then completely stripped out of the post. Perhaps that's correct! I see it can be put in the description (Alan Crease, one of my members, e-mailed you) and I'll try that when I have time.
It may be OK just to have it in a Woki page!