It’s more common than you think, when vehicles are due for replacement they are usually sent to the forces workshops or vehicle centre, it’s not uncommon to find vehicles 10+ years old come from any department sitting around or being used when needed in the months before they are decommissioned. Bicester traffic workshops had a 54 plate traffic Vectra in a few months back, it had come from a training centre but was still used for a while before being stripped of all it’s battenbergs