Use your mouse to move the map around, click on it and drag.
Each of the orange markers on the map represents a region of the United Kingdom.
To view the restaurants available in each region of the UK, click on a orange regional marker. Links in the appearing map bubble will allow you to zoom in on the map to see the individual restaurant location markers.
Use the + and - buttons on the map or your mouse-wheel to zoom the map in and out for more details.