Vocabularies that are created and/or edited in the vocabulary editor are not available to the public until they are formally published.  Once published they are accessible for the public to view without restriction at http://vocabs.ceh.ac.uk/.

Only users in a Vocabulary Manager role are able to publish vocabularies

To publish the production copy of a taxonomy:

Open the taxonomy you wish to publish

Go to the Export tab 

Click on the Taxonomy as Explorer Published Version link

Choose an option from the STATUS dropdown:
   - Published.  If this is the first time you are publishing the taxonomy
   - Update Published Copy.  If you are updating a taxonomy that is already published

A dialog box will show the progress of the publication process and will inform you when the publication/update is complete