The Zoom control to the left of the map image lets you zoom in or out in stages by clicking either on the
or
symbols to zoom in or out a step, or by clicking on one of the little 'pip' marks in between, to jump straight to that scale. One of these pips is always highlighted, indicating the approximate current scale that you are viewing at.
If you get lost, clicking on the pip mark just next to the zoom out
symbol will take you to England scale again.
To zoom in to a box area, hold down the key and click and drag with the mouse to define a box to zoom to.
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