VA13904 Jaguar XJ6 (Series 2) 4.2. Thames Valley PoliceFrom late summer 1974, the Thames Valley Police (TVP) XJ6 modelled was based at TVP HQ, Kidlington, or 'Traffic South' as it was known. This was also where TVP serviced their vehicles. It was one of a number of 4. 2 litre Jaguars, all fitted with a manual overdrive gearbox, used by TVP 'Traffic' for motorway work. They were very popular with the officers who crewed them and many considered them to be the best motorway car that the force ever used;