Except that if you were brought up in the 50s/60s/70s/80s in the Netherlands, you may have learned to speak English with what sounds to a Brit like an American accent, in part because so many of your EFL teachers were former US soldiers or their spouses who settled. (Exposure to US media is a secondary aspect)

This was a very noticeable phase in the UK; I knew several Dutch people who were fully unaware they had American accents and some American linguistic traits until they got here.

Whereas Dutch friends of my father who learned English before WWII had actually quite plummy English accents.