There are currently 431,241 Motability cars being used in England and Wales. Details of funding provided to Motability are in the following table.
£000 Specialised vehicles fund Administration 2004-05 8,375 2,700 2005-06 8,615 2,800 2006-07 9,087 2,800 2007-08 12,700 2,960 2008-09 17,036 2,960 Notes: Motability administers the specialised vehicles fund on behalf of the Department for Work and Pensions. The Fund provides financial assistance to those disabled drivers or passengers on the scheme who require extensive adaptations to their vehicles. The majority of these adaptations allow the disabled person to travel as a passenger, where necessary entering the vehicle and travelling while remaining seated in a wheelchair. Source: Motability.
Motability is an independent charity and is responsible for the administration of the Motability scheme. We have no reason to believe that this Department would accrue any savings if Motability changed their cars every six years.