This website has an Accessibility Tools widget that enables users with Visual impairment to change the size of text on the pages, together with contrast and other features.  

You can also toggle other screen features such as high contrast, negative contrast and greyscale making the user experience better suited to people with Visual impairment.

To activate the widget, click on the box icon (little man) on the right hand side of the screen displayed on all pages to activate the widget.

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