 CONT: When Regan, Carter and Ingram are sitting in Ingrams blue  Cortina, its front numberplate is DLO 97M. A few seconds later when  Ingram drives away from Tobers shop after stopping to ask  directions, the rear numberplate is NHK 296M. In order to make the  fleet of cars look larger, the producers sometimes put false plates  on cars, but they evidently only changed the front plate in this  case.