Jackson wore his character's kilt, a tam o'shanter emblazoned with the film's name, a chunky navy wool jumper and boots.

He disclosed: "I love it and have even been wearing it Scottish style."

Co-stars Emily Mortimer, Sean Pertwee and Rhys Ifans also attended the screening at the Curzon cinema in Mayfair. As did Tara Palmer Tompkinson and Denise Van Outen.

The film was set in Liverpool and of the locals Jackson said: "They were a lot of fun and I even understood what they were saying."

He said he enjoyed eating Chinese food in the city and enjoyed the opportunity work with "really great British actors".

The action comedy sees streetwise US master chemist Elmo McElroy (played by Jackson) arrive in England to set up his last big deal and introduce a new designer drug to the European market.

Soon embroiled in a web of double-dealing, kilt-wearing McElroy is accompanied around the city's underworld by loud mouthed Scouser and American-hating gangster Felix De Souza (Robert Carlyle). The unlikely pair are forced to hook up and forget their differences in the film from Hong Kong leading action director Ronny Yu.

Hailed as a major breakthrough for Liverpool as a location, the 95-minute film cost £20 million to produce. The 51st State is released in the UK on December 7 by Momentum Pictures