Unfortunately the Netherlands is a world on it's own. Lack of mountains and lots and lots of greenhouses for farming. I lived in Brisbane and had bad light pollution, but if I drove 30min I was in a reasonably dark sky, and with 2 hours driving I get to a wonderful pitch black.
Where I live at the moment, 30min just puts in in Greenhouse central. 2 hours puts me just on the other side of Utrecht, Breda, 's-Hertogenbosch, somewhere between the The Hauge and Leiden (which are so close together I don't think you'd notice you change cities) or on the outskirts of Amsterdam. Too many cities too close together
London is worse than where I live, but it doesn't take much to get away from it's glow.
That said I think my best bet for a darkish sky is in Germany on the way to Bremen, but even that doesn't compare to what's available in Brisbane just on the other side of the range.
A UHC filter I think may be a must for me in the future. Shame it screws with the colours.