(11 Sep 2014, 3:16 pm)Dan wrote Unlikely. Three vehicles would be branded with a corporate liveried spare if it's most likely for the PVR to be three.
The fact that four are branded and four will remain branded after this repaint suggests to me that four is usually the minimum PVR (and indeed this has been the case on all of my observations).
It's not a normal service though in that the loadings (and therefore vehicles required) varies according to what DFDS have booked... One day it could be 3, next it could be 10!