Thank you so much for trying to help, but unfortunately I have a different lay-out and options, and when I get to the 'manage account' section there is no option to change the screen-name...... perhaps its different for the british site? Can I ask what screen name you see for me? Thank you
Sorry about this, but the system for changing your Screen Name is currently not available via the corporate website.
Since the UI team implemented the new skin for the 2014 release of CC, they switched over to using https://accounts.adobe.com for managing your "profile" - but this is only designed for stuff relating to a CC subscription.
The problem was reported internally in June, still waiting for them to respond. Until they fix it you can follow this link to an unlisted page, where the old Account Manager is still functional:
https://www.adobe.com/account/account-information.html
You need to be logged in to the corporate website before clicking that link. It will work for any localization, including EDU customers.