Douglas Hickox’s Brannigan (1975) stars John Wayne as a tough Chicago cop sent to London to extradite a gangster, only to clash with Scotland Yard’s refined methods. Mixing Action and Crime Thriller traditions, it’s a lively Police Procedural & Crime Investigation with touches of Buddy Action humor — a transatlantic culture-clash that pairs Wayne’s rugged authority with swinging-’70s London style.

Veteran Chicago detective Jim Brannigan (John Wayne, The Searchers) is dispatched to London to bring back notorious gangster Ben Larkin (John Vernon, Dirty Harry), and is assured that the whole operation will run smoothly. However, when things don’t go to plan, Brannigan finds himself in the crosshairs of Larkin’s thugs. Reluctantly teaming up with by-the-book Commander Swann of Scotland Yard (Richard Attenborough, The Great Escape), but determined to recapture Larkin no matter what, Brannigan tears through London, leaving a trail of destruction in his wake.

Boasting incredible stunts, powerful punch-ups, dry dialogue and panoramic views of 1970s London shot by cinematographer Gerry Fisher (The Go-Between, Highlander), as well as a superb supporting cast including Judy Geeson and Mel Ferrer, Brannigan still stands tall as an explosive, action-packed, highly entertaining and peculiarly British excursion for the legendary John Wayne.

Från IMDB:
Chicago Police Lieutenant Jim Brannigan is sent to the U.K. to escort organized crime boss Ben Larkin back to the U.S., but Larkin's hitmen prepare an ambush for Brannigan.