In August 2007, CountyWatch took its campaign to Bedfordshire, where, in November 2006, Bedfordshire County Council erected four signs on the main roads on the north, west and south sides out of Luton proclaiming 'Welcome to Bedfordshire'. Luton is the largest town within the historic and ceremonial county of Bedfordshire. Some letter writers still address mail to "Luton Beds". Some organisations based in Luton, such as the University of Bedfordshire, include 'Bedfordshire' as part of their address. In 1996, the Royal Mail stopped using Postal Counties as a method of sorting mail, using instead the post code. However, they have a "flexible addressing policy" whereby historic counties can be used. Luton became a unitary authority on 1 April 1997. Bedfordshire County Council no longer runs any services in the area covered by Luton Borough Council.