I've not long been on a trip to the Netherlands. 
Didnt do much gricing when I was over there, but in the places we were at, I noticed the prescence of Connexxions and Arriva.
The Arriva Qline brand appeared to be quite dominant, using a mix of Merc and Volvo engined vehicles.

One trip out in the car through a particularly rural and scenic part of Schouwen-Duiveland, brought me in to sight of a black VR.
We were driving at speed, but I made note of its location. 

By process of elimination and Rob Sly's excellent site, I think I have tracked down said vehicle and done so a lot quicker than I ever imagined.
Google maps has a black VR parked up in the area I saw it and Rob Sly has a black VR registered at a location just a few miles down the road from where I spotted it/Google maps has the VR.

Turns out it's ex-Cumberland 428.

http://bcv.robsly.com/fao428v.html
https://www.tripadvisor.co.uk/Restaurant...vince.html

Worth noting that the area operates a zero fare policy in the summer months. 
Unfortunately the closest you will get to 428 is if you buy chips!