As everybody reading the excellent study of history since Caesar’s times of the North Sea trade by Oxford historian and former BBC journalist Michael Pye, “The Edge of the World: How the North Sea made us what we are” can attest, the trade relations between the British/English and the Dutch (Frisians) Celtic tribes was the beginning of 20 centuries of close economic and ethnic ties. The DNA of inhabitants of areas from Kent to York is indistinguishable from that of people living in Friesland and Holland in the Netherlands; and Frisian is halfway the English and Dutch language. Migration and trade in wool, cloth, grain, herring, etc., been going on, even when Napoleon didn’t want it to (1803-1813); John Locke wrote important (Liberal) books seeking shelter here.
Ever since the 4th Anglo-Dutch war (1780-’84), the Dutch have recognised the British as their senior and vital partner in those economic and cultural relations; and the Dutch pressed general De Gaulle to admit England in the EEC for those same reasons.
But one aspect of how the Dutch see the British people and British politics has been fundamentally changed by the way the UK has been handling the Brexit problem, from the Referendum campaign in spring 2016 to the present day. That can be concluded by what 3 of the 4 official “Brexit Watching delegates” of the Dutch parliament said on Dutch public radio on Wednesday, 14th of January 2019; coincidentally those 3 were from parties of the present Dutch government coalition, so important advisors of both parliament and government.