The Boat That Rocked

Wikipedia:
"The Boat That Rocked is an upcoming ensemble period comedy film, scheduled for release in 2009. The film is set in 1966 and tells of the United Kingdom pirate radio movement, which illegally broadcast to audiences of up to 25 million from ships anchored off the coast of the UK. The film is written and directed by Richard Curtis and is being made by Working Title Films for Universal Studios. The Boat That Rocked stars Philip Seymour Hoffman, Bill Nighy, Rhys Ifans, Nick Frost and Kenneth Branagh. Principal photography started on March 4, 2008 on location off the coast of England and is expected to end in June 2008."

a link to a picture of the ship in that film: http://www.anoraknation.com/discussion/messages/2241946/The_boat_that_Rocked.JPG

That ship is the same as Hospitaal Kerkschip De Hoop that broadcast weather reports, general messages and Dutch language church services in the seventies and early eighties in the North West European Waters.
http://www.ais-live.co.uk/News/shippingnewsarchive.html
http://www.offshore-radio.de/fleet/hoop.htm