 Southdown celebrated its 70th anniversary in 1985, the year before deregulation, and buses carried a special logo (shown above) which also appeared on publicity.With deregulation, the company adopted "Southdown East & Mid Sussex" and "Southdown West Sussex" fleetnames, while the Brighton & Hove operations became a separate company (Brighton & Hove).The East Sussex division registered a fairly basic network from the outset, linking a number of services together to form trunk services linking the major towns, sometimes by fairly circuitous routes.