Recently the site has been up-dated, some of the up-dates are HTML5, to view the site correctly you will need a browser that supports HTML5,
IE9 or
Google Chrome would do.
Here is a screenshot of the sites new appearance:

HTML5 Site Changes
Click it to enlarge.
If you don’t see the site with rounded corners and dropdown shadows, as it is in the screenshot, and you have an HTML5 browser, press Ctrl and F5 on your keyboard and hold them down for a couple of seconds, to force a re-load.
You might want to do that on any page that doesn’t look right, including
www.datahopa.co.uk, which has had a redesign too.