Press release in Amsterdam ...
"21 March 2018
A new short-sea container service between Amsterdam and Hull will be formally inaugurated today (21 March 2018) with the first call of the 340-TEU vessel THEA II at Amsterdam Container Terminal (ACT).
The new service, operated by leading short sea container operator Samskip, offers three sailings a week on this new route with vessels departing from Amsterdam on Mondays, Wednesdays and Saturdays."
I guess the last time we had a direct link was way back in 1970's with the Stroom boats of Holland S.S.