I checked the page again, Googlemaps was being blocked due to privacy settings, I can't turn those settings off on the machine i'm using at the mo but I'm going to try again on some other machines.
I only noticed this because of the little eye icon that appears on the bottom of IE. I'm not sure what settings are causing this issue as I can view googlemaps fine from other sites.
EDIT
Using the main link, I got the map to work by pressing the stop button on my browser.
For some reason the page was taking ages to finish loading, so I stopped it and the google map magically appeared and started working.