Dutch soldiers sometimes train together with the British! Also, the Embassy of the Netherlands in the UK has a department that deals with the military relationship between the two countries.
DutchPlateSpotter Wow! Dutch military van in the UK, haven't seen that before!
I see them literally every week here in Northern-Norway. A few weeks ago I passed by a convoy of about 25 Dutch military trucks, both old DAF's and new Scanias, plus several Trafics and Sprinters. Have also seen plenty of Amaroks, which look almost identical to the ones used by the military in Southern-Norway.
I also saw a British Transit minibus driven by a soldier last week, it's the first one I've seen so far.