A new feature has recently been deployed to allow customers to select the size of text to view the website with.
The following text size control can be seen in the header of every page.

Click on the "A" representing the size of font you require, this will then be retained for the rest of the site.
Currently some pages held on external systems such as press releases and meeting agendas, are unable to offer this functionality, however, this is something we hope to improve in the future.
This functionality can only work if JavaScript is enabled. Please see the FAQs on the right hand side of this page.