Southdown PSV Limited, trading as Southdown Buses, is a medium-sized country bus operator, with 18 routes across East Surrey, West Sussex, South London and Kent, 9 of which are school bus routes. Most of their routes are operated on behalf of Surrey County Council, other work includes railway replacement services for planned engineering work. Southdown Buses operates mainly in Oxted, Horley, Redhill, Westerham, Lingfield, Caterham, and East Grinstead. Their only operating garage is in Copthorne.