For those here who are wondering why there are so many British actors in a show about Dutch police, could I point out: a) I'd be quite happy to watch a subtitled Van der Valk series made by Dutch TV, but there's no such thing; and b) Nicolas Freeling, who wrote the original books, was a Londoner. By the way, if you're in the UK and want to see the original series, at time of writing they're showing it on the mighty Talking Pictures TV channel.
Review of Van der Valk
