To add an external link icon

I.E. When the link is external to your site but still on the .cam.ac.uk domain.

Add the "campl-external" class to the corresponding <a> tag.

E.g. <a class="external-link campl-external" ....

To remove an external link icon

Add to ploneCustom.css:

/*remove icons from links to external websites*/

a.campl-external {background: none;padding: 0;}