I have been issued with an enforcement order to cease and remove all unauthorised development from a rural site. The development on the site consists of a 175sqm stable block and has the benifit of an exempted development certificate. The development was built in 2006/7. In 2008 an unauthorised apartment was constructed in part of the stable building. A written undertaking has been issued to remove all unauthorised development i.e. the apartment. The stable is being returned to it's original exempted development status. The Planning Authority have sent the file to their solicitor and seem to be seeking to have the stable block demolished, i.e. the building rather than the use is unauthorised. I am seeking a section 5 on the matter of exempted development. Any advice?