 By the 1980s, the sections of route between Heathrow and Windsor and between Gravesend and Dartford had been withdrawn.At that time the Green Line network was operated by London Country Bus Services, but when that company was broken up in 1986 route 726, which ran almost entirely within Greater London, came under the control of London Country North West (LCNW) and Kentish Bus & Coach.In 1991 LCNW planned to withdraw the route, but London Regional Transport stepped in and took the route over.